Preface

Snowfall
Posted originally on the fanfiction.lol at https://fanfiction.lol/works/638.

Rating:
Explicit
Archive Warning:
No Archive Warnings Apply
Category:
Slash (M/M)
Fandom:
One Piece (Manga)
Relationship:
Sanji/Usopp (One Piece)
Characters:
Usopp (One Piece), Sanji (One Piece)
Additional Tags:
Alternate Universe - Setting Change, Paranormal | Supernatural, Alternate Universe - Fantasy Creatures, Werewolves, Monsterfucking, Size Kink, Blow Jobs, Anal Sex, Knotting, Multiple Orgasms
Language:
English
Series:
Part 4 of SanUso Week 2025
Stats:
Published: 2026-10-11 Words: 6,406 Chapters: 1/1

Snowfall

Summary

There's a snowstorm approaching. Usopp has done his best to prepare for it, but that's not the only thing he has to worry about.

SanUso Week Day 4: Monster/Snowed In

Snowfall

The snow crunched under Usopp's boots.

He made his way across the field, his feet sinking into the snow covering the ground. The prevailing wind whistled, stinging his nose and bare cheeks. He wished he had a hand free to pull his hat lower to better protect his ears, but the hay bales he carried prevented that.

The sky was overcast. Early this morning it had been clear, the midwinter sun glinting brightly on the thick crust of snow blanketing the field and surrounding forest, but as evening approached clouds had appeared, stealing ominously across the sky until every bit of blue was hidden by a layer gray. There'd be more snow tonight, without a doubt.

The wind cut off abruptly as Usopp stepped into the lee of the three sided shelter. The familiar scent of hay and manure hit his nose. His small herd of goats perked up at the sight of him.

"Guess who's baaack?" Usopp sang, dropping the hay bales he brought along the wall of the shelter. "Everybody up, I got your dinner right here."

Three of his eight goats blinked placidly at him, not moving a centimeter. The rest rose from their places nestled in the straw and approached. A few started chowing on the hay immediately, ripping out large mouthfuls and dropping half of it on the floor as they rapidly chewed.

Sunny, a particularly large and frisky goat, butted her head against Usopp's hip. He feigned being knocked off his feet, saying "oof" and staggering a few steps. She followed, playfully bumping him again, and he gave her a few pats.

"I know, I know, you want to hear the rest of the story," Usopp said, scritching between her horns. "It's gonna be short, I have some things to do before the snow starts back up. Where was I…? Ahah! We were sailing up the river when we ran into some strange creatures called kung-fu dudongs…"

Usopp had never expected to end up living on a farm in the middle of nowhere, telling bedtime stories to a herd of goats like they were small children, but life had a funny way of throwing curveballs. He had inherited the land from his estranged father almost three years ago. Usopp hadn't seen the man in fifteen years, not since he walked out on him and his mother when Usopp was a child, but for whatever reason, he left the estate — an impressive acreage of woods and fields, a barn, four goats, and one falling down cabin full of odds and ends — to his closest blood relative. Usopp sold a few things, but decided to keep the place. Franky, Luffy, and his other friends helped him demolish the ramshackle cabin and build a proper house. Having this farm turned out to be rather serendipitous, what with all the other big changes that happened later that same year.

"We left the ship and set out across the desert. We didn't know it, but our troubles were just beginning…"

As he told the story, Usopp ran a quick check around the shelter. Everything was dry; the roof was holding up well this winter, and the goats hadn't tracked anything in since he'd visited them earlier. Their water trough was free of ice; the goat-proof heater he'd rigged up for it was working fine. A thick layer of hay covered the ground, plenty for the goats to dig little beds in and stay warm. Once they ate, the goats would be set for the night. The extra bales would be enough to keep them satisfied until he could dig his way out here after the storm.

Outside, the wind gave a sudden powerful gust. Whipping over the hills, it sounded like an eerie howl. It caught the branches of the trees, making them groan and shake in an unnerving cacophony.

Usopp looked out over the lonely landscape, feeling a pang of fear.

A few fat snowflakes flitted past. Otherwise, nothing but the tree branches moved on the wintery land. This place was fairly isolated. Usopp's property had no nearby neighbors. The woods and hills stretched as far as the eye could see. The wind could pick up sounds and carry them for miles, or scream loud enough to drown everything else out.

Worry gnawed at Usopp's stomach. There was no telling what kind of dangers laid waiting in the woods. Predators, alone or in packs. Poachers, bear traps. Creatures that stalked the night, on the hunt for unsuspecting prey. All that, with a blizzard bearing down.

Anything could happen, and there would be no one to call for help.

Usopp shook his head. He had to stop thinking like that, all it did was make him paranoid.

He kicked the horse ball in the corner, and a couple of the goats went trotting after it. Sunny took her turn at one of the bales, and Usopp wrapped up his narration, promising the goats that the next segment of the story would come tomorrow. If they noticed today's tale was a little more rushed than usual, none of them complained.

It was impossible to see where the sun was in the sky, but Usopp knew that it was setting. As the world grew dimmer and dimmer, he hastily finished the last of his chores and preparations for the storm. He battened down the shutters, and built up a fire in the fireplace. He brought more chopped wood inside, storing it where it wouldn't freeze.

He muttered to himself as he worked, sometimes working on the next part of the story he'd tell the goats, sometimes just narrating his own chores so the lonely howl of the wind wasn't the only sound he heard.

As night fell, Usopp turned on the porch lights. He couldn't see much beyond the end of the porch. Snow was coming down faster now, thick flurries where earlier there had only been a light sprinkle. It would only get worse as the night went on. Anxiety squeezed his throat. He imagined his house as a tiny beacon, swallowed up by the dark.

He shook himself out of it. Everything would be fine.

Determined to keep his mind off of his fears, Usopp wet a rag with hot water and washed away the sweat and goat smell he'd accumulated over the course of the day. He prepared for bed, and changed into a sweatshirt and fuzzy pajama pants, with a thick pair of socks to complete the ensemble.

The wind howled outside. It seemed to Usopp that he could hear an echo of some kind. Another kind of howl, barely audible in between gusts. Something inhuman, out in the storm.

An hour passed. Then two. There was a chill inside him, a cold, creeping fear that seeped into his bones and left him shivering no matter how many layers he had on. Music didn't chase it away, and he couldn't concentrate enough to sketch anything, so he heated up a cup of hot chocolate. He mixed warm milk with one of the packets of instant cocoa mix he kept hidden in his dresser. He settled on the couch in front of the fire with his mug.

Outside, the trees groaned in the wind. Ice pelted the windows.

Something creaked. It wasn't the trees or shutters or any of the sounds Usopp had been hearing all night. It was faint under all the other noise, yet distinct. It came again, the low creak and groan of boards bending under some great weight. A scraping noise like claws over wood.

His stomach a knot of anxiety, Usopp got up and went to the door. Something was out there, making its way across the porch. Usopp opened the door. A blast of icy air hit his face, wind like freezing fingers slipping under his sweatshirt to chill his spine.

A monster stood on the porch.

Thick gray fur covered it from head to toe. Densely muscled, with razor sharp claws at the end of each oversized hand, it stood on its hind legs, tall enough that its head nearly brushed the eaves. Its wolf-like head turned, putting Usopp nose to muzzle with its mouth full of knifelike teeth.

"What are you skulking around out here for?" Usopp snapped.

Sanji shook himself, splattering the porch (and Usopp) with ice pellets and half melted snow. "I was trying to get the snow off," he said. "I didn't want to track it through the house."

"You can do that in the foyer, now get in here before you let all the warm air out!"

"You're the one who opened the door."

"Because I heard you, dummy. Look at this, you're half frozen," Usopp clucked, picking at the ice in Sanji's fur as Sanji made his way past him, into the house. "Standing out in the freezing wind won't help."

"I'm fine," Sanji said, before giving Usopp a toothy yet lascivious smile over his shoulder. "Besides, now I have you to warm me up."

"Not until you're dry, you don't."

Usopp followed him in, shutting the door behind them. Sanji wasn't usually this late. Normally, Usopp's werewolf boyfriend tried to be in not long after dark the second night after the full moon, when the waning moon loosened its grip on him. Usopp supposed it couldn't be helped, considering the weather. Regardless, he was glad that Sanji was finally home and safe.

Sanji grabbed a towel and went to work. The snow in his fur was already starting to melt; a mixture of water and slush dripped off him. Usopp had laid out towels in the foyer for this exact reason.

"How were the woods?"

"Cold," Sanji said, picking ice out of his tail. "Cold and quiet. It seemed like almost every other creature out there had the sense to stay warm in their burrows."

"Did you eat?" Usopp asked.

Sanji, a lifelong cook, had an uncomfortable relationship with some of his animal instincts. The wolf was hungry, but the man — what little was left of him during the height of the full moon — was adverse to eating raw meat. He'd become more accepting over last year or so, understanding it was simply the wolf's nature; he used hunting as a means to work through his energy and focus his more violent impulses, but occasionally that squeamishness pulled through.

"I caught a rabbit, early on. Didn't find much else."

"Are you hungry? We've still got a few pounds of venison in the freezer if you want."

Sanji shook his head. When he'd rubbed off as much of the excess as he could, Sanji went and laid down in front of the fire. He beckoned for Usopp to join him.

Grabbing one of the smaller towels, Usopp sat down next to Sanji. He patted his lap, and Sanji laid his big wolf head across Usopp's thighs. Usopp worked the towel around Sanji's ears and the thick ruff around his neck. With Sanji home, out of the storm, the anxiety that had gripped Usopp melted away. He felt warm, inside and out, for the first time all evening. The low level stress that had plagued him for days finally began to ease.

Unlike in the movies, werewolf transformation wasn't a one night thing. Although the full moon was when the wolf's instincts were strongest, the actual transformation took place two to three days before the moon reached its zenith, and lasted until a few days after. Sanji preferred to roam the woods while in his wolf form. Though he knew Sanji could handle himself, Usopp still worried while he was gone. It was worse in the winter months, when storms and other dangers abounded. The worry was like tinnitus, a constant buzz in his brain. The only way to make it go away was to have Sanji back, safe and sound.

For a few minutes they sat quietly, enjoying the warmth of the fire. Then Sanji sniffed the air. He followed an invisible trail, lifting his head to trace it back to its source. His lips curled when he caught sight of the mug Usopp left on the coffee table. He whipped around to glare at Usopp, sticking his big wet doggy nose in Usopp's face to smell his breath.

"You made that shitty instant hot chocolate again, didn't you?"

Busted.

"It's not shitty if I like it."

"That garbage is nothing but processed sugar, I don't know how you can stand it."

"You're just a snob about making everything from scratch," Usopp shot back.

If Sanji was farther out from the transformation, he might insist on whipping up some hot chocolate the 'proper way'. But he wasn't fully back yet, even though he's human enough to pester Usopp about his comfort foods. Besides, despite his sharp remarks, Sanji never actually did anything to stop Usopp from making it.

The sugary, cheap, instant mix hot chocolate was an old comfort food, one that brought back warm memories of his mother heating milk on the stove when he was little, and sitting under a blanket with her to drink and watch the snow swirl outside the windows. Even all these years later, Usopp made it whenever he felt especially nervous.

Sanji knew what the drink meant to Usopp. And it was because he knew that he asked, his teasing scowl giving way to concern, "Did something happen while I was gone?"

"No, nothing happened."

"Are you sure?" Sanji asked, rubbing Usopp's thigh.

"I was just worried."

"There was nothing to be worried about."

Though the relief of having Sanji home safe warmed him, Usopp had spent all evening struggling (and failing) not to worry. He'd grown tense as their usual check in time came and went. The tension in him had felt like a wire, pulled more and more taut as the night went on. Sanji's words caused that string of tension in Usopp to snap.

"Yes there is!" Usopp burst out. "I was worried something happened to you out there!"

Sanji sat up, gathering Usopp in his arms to hold him tight to his broad, fluffy chest. Usopp buried his face in his ruff, the alien form he'd been so scared of a few short years ago now a familiar comfort.

"I'm fine, mon amour. I know these woods well."

"I know, but with the storm moving in, I didn't know if you'd get lost in the snow, and last month you saw those hunters in the woods…"

No matter how strong or fast Sanji was in this form, bullets and traps could still hurt him. There were other werewolves out there, dangerous werewolves, and Luffy had just tangled with a warren of vampires a couple of weeks ago. Out there, Sanji was alone, and had no way to contact anyone.

"I'd have no way of knowing if anything happened."

Usopp's eyes burned. He blinked to get rid of the tears, tried to hide the hitch in his breath, but Sanji felt it and squeezed him tighter. Usopp took a deep breath. He tried to remind himself that Sanji was smart and capable. He'd been doing this for two years now. Usopp should be used to it.

"Sorry," Usopp said, wiping his eyes. "I didn't mean to snap at you."

"It's alright," Sanji said. "I can understand your concern."

Usopp smiled ruefully. He was glad that, at the very least, Sanji understood that people worried for his well-being. It had taken a long time to get through to him about that.

"I don't want you to stress over this so much," Sanji said. "Is there anything we can do to help you?"

Sanji's willingness to listen helped Usopp calm down. As the tension left his body, Sanji's grip loosened. Usopp slid until he was seated in Sanji's lap and could lean back against his chest. Sanji was a furnace, the fire and his own natural body heat making his fur feel like laying on an electric blanket.

"I don't know. More check ins?"

"I don't know if I'll remember, when I'm hunting. It's hard to keep track of time out there."

"Hmm. Maybe if you weren't alone out there," Usopp mused, thinking out loud. "We could ask some of the others to hang around or go out with you." Luffy could keep up with Sanji in werewolf form. Zoro and Brook too, thanks to their curses, though inviting Zoro over when Sanji was extra strong and territorial was not a good idea.

Sanji gave an amused huff. "Do you really want the others here, barging in on post transformation activities?"

"Not really," Usopp said, feeling a little jolt in his stomach. He and Sanji had a tradition, of sorts. It wasn't the kind of tradition to be indulged in around friends.

"We can see about a tracking device," Sanji said, stroking Usopp's side.

"Maybe an emergency beacon," Usopp said. He worried for Sanji's safety, but a tracking device felt a little too stalkerish for his tastes. Sanji wasn't an animal to be chipped and tracked. "Something you can activate, or will turn on if you miss a check in. I don't know how we'd put it on you though. You don't exactly have pockets, and short of a collar…"

Sanji grunted.

Something twitched against the base of Usopp's spine. He blinked. Realization dawned, and he smiled coyly.

"A collar might work," Usopp said. "In fact, I'm surprised we didn't think of it before. A collar would be perfect for you."

Sanji shuddered against his back.

If Usopp knew he would be so reactive to the idea of wearing a collar, he would have brought it up months ago. He was absolutely going to remember this. He turned in Sanji's lap to look at him.

Werewolves couldn't blush, but Sanji's pupils were large. He ears were pricked forward, at attention.

"Something I said?"

"We have a month to figure something out. Can this conversation wait?"

Usopp laughed. "You look eager. Thinking about post transformation activities again?"

"Am I dry enough now?" Sanji was giving him that lascivious look again. His massive hand rested on Usopp's waist.

Warmth pooled in Usopp's belly. "Hmm," Usopp said contemplatively. He reached up and stroked Sanji's cheek, which between the fire and towels was perfectly dry. "I don't know. Better let me check." His hand moved from Sanji's cheek to his neck, then down his chest. He traced the shapes of Sanji's muscles beneath the fur, delighting in the way Sanji shivered and pressed into his hands.

Sanji rumbled, pleased. He leaned in and licked Usopp's neck.

Usopp laughed, and Sanji did it again. Usopp ducked away from the slippery, ticklish feeling, and Sanji followed, playfully licking and nibbling at his neck while Usopp grabbed big handfuls of his ruff. Though he protested, Usopp only pulled him closer instead of pushing away.

Sanji pushed Usopp down against the rug. He went easily, opening his arms to welcome Sanji as he crawled on top of him. Sanji rubbed his thin black wolf lips along his cheeks and neck, while one massive, paw-like hand worked its way up Usopp's sweatshirt, claws held carefully to avoid scratching him while Sanji rubbed over his waist and belly. Usopp knew from experience (and a few research dives on wolves — not werewolves, it was hard to find any reliable research on a species most of the world believed didn't exist) that Sanji was scenting him.

He was even more of a possessive bastard in wolf form than he was as a human.

Their mouths did not fit together at all, but they made do. Usopp kissed Sanji's nose and muzzle, digging his fingers into the thick fluff at his cheeks and neck. Sanji licked his way into Usopp's mouth. His tongue was large and wet; enough to fill Usopp's mouth. Usopp licked at and sucked on it as best he could without choking.

Usopp reached between them. He ran his hand down Sanji's furry belly until he found his sheath. The tip of his penis was already poking out of it. Usopp stroked it, running his fingers over the hairy sheath and gently curling around the barely showing cock. Sanji pressed his face into Usopp's neck. Under Usopp's ministrations, his cock emerged, growing in length and size until Usopp could wrap his whole hand around it without touching the sheath.

Sanji groaned into Usopp's neck as Usopp pumped his cock.

Touching Sanji, kissing him and hearing his noises, made the warmth in Usopp's lower half spread. He could feel his own cock chubbing up, already half hard. He pressed kisses to the top of Sanji's head. He stroked his palm over his cock one last time before letting go.

Sanji whined into his shoulder like a needy puppy, and Usopp laughed.

"Come on," he said. "Let's move to someplace more comfortable." Preferably before Usopp got rug burn.

Sanji sat up. His huge cock was fully emerged from its sheath. It bobbed, red and heavy with arousal. He grinned toothily when he caught Usopp looking at it.

"Shut up," Usopp said.

"I said nothing," Sanji said innocently. Claws pricked Usopp's hips through his clothes as Sanji effortlessly scooped him up and carried him to their bedroom.

Usopp giggled when Sanji dropped him on the bed.

"You're overdressed," Sanji noted.

"Not all of us run around the wilderness in our birthday suits," Usopp sniffed.

"You should try it some time. Clothes can be such a hassle. Take right now, for example."

"Mm, we should probably remedy the situation. Help me out?"

"Gladly." Sanji knelt on the end of the bed.

Usopp tugged his sweatshirt over his head. He'd barely thrown it to the side when he was yanked down the bed. His back hit the mattress. Gripping Usopp's ankles at the end of the bed, Sanji smirked before tugging off Usopp's pajama pants.

"Brute," Usopp teased.

Sanji took off his socks one by one. Usopp teased the hem of his underwear, playfully dipping his fingers in, pulling the edge down slowly. Sanji's eyes followed his movements raptly. Though he was sure he could tease until Sanji snapped and ripped them off himself, Usopp himself was too impatient to wait. He pulled down his underwear and dropped them off the side of the bed. Then he laid back, sprawling on the soft blankets with his legs spread and hands above his head.

Sanji's eyes raked him up and down, hungrily taking in his nude body.

"Beautiful, my love," Sanji said. "You are as lovely as a full course meal set before a starving man. I cannot wait to devour you." Even when horny and transformed into an actual beast, he never failed to wax poetic, and Usopp loved it.

"Come here, sweetheart," Usopp said, raising his arms.

Sanji crawled up his body and Usopp wrapped his arms around him. Usopp squeezed him tightly and buried his face in his fur. Loving the way the fur felt against his bare skin, downy and soft and covering him from head to toe. Loving even more the way Sanji rested his weight on Usopp and curled around him.

Sanji had been so afraid of himself, the first few months after becoming a werewolf. Avoiding their friends and refusing to let Usopp come close, let alone touch him, when he was transformed. So afraid that he was or could become a monster in more than just form. It had taken a long time to get to this point. It warmed Usopp to know that Sanji trusted himself enough to hold Usopp this way, that Sanji understood that he wouldn't hurt him, and that he knew Usopp trusted him in turn. To have Sanji in his arms now, so happy and eager, had taken months of persistence, love, and difficult conversations, but it was worth it. Sanji had always been worth it.

They rocked together. Dragging their cocks against each other, holding and petting. Usopp relished the feeling of Sanji's warm weight atop him. He loved it when Sanji covered him with his body and held him down, letting Usopp feel the strength and warmth all around him. It made him feel safe. Safe and wanted, even more so than Usopp already felt with Sanji.

Sanji shifted his weight, moving just enough to reach between them. Sanji's hand in werewolf form was big enough to wrap more than halfway around Usopp's waist. It dwarfed Usopp's penis as Sanji gave him a few quick strokes. The texture of his padded fingers and the webbing between them felt wonderful against Usopp's sensitive skin.

"Ah—mphh—"

Sanji cut off his moan, lapping at Usopp's lips until he opened his mouth once more. He filled his mouth with his fat tongue and thick saliva.

Usopp shuddered as Sanji rubbed gently at his ballsack with those rough pads. He choked on the tongue in his mouth when one of those large, questing fingers moved further back, dragging along his perineum until it found his asshole.

Sanji disconnected their mouths.

"Oh? What's this?"

He tugged at the knob protruding from Usopp's hole, causing the plug to shift inside him.

Usopp gave a short moan at the sensation.

"Foresight," Usopp said, eyes squeezing shut as Sanji twisted the plug.

He'd prepared himself and slipped the toy in while getting ready for bed, knowing from experience how impatient they'd both be after several days apart. Anxiety and Sanji's tardiness had made it more than a little uncomfortable, but removing it had taken a back seat when Sanji did finally arrive home.

Sanji pulled the plug halfway out, then thrust it back in with an audible squelch. Usopp moaned.

"Plenty of lube, I see."

When one's werewolf boyfriend had claws, an enormous phallus, and monstrous stamina, one learned to prepare and prepare well.

Sanji gently removed the plug. He tossed it aside, then grabbed Usopp's plush thighs in those massive hands. He spread Usopp's legs and shuffled down the bed until he could easily reach between them.

Usopp tried not to think too hard about the way his cock twitched at the sight of those sharp, gleaming teeth so close to his dick.

The first pass of that long, slick tongue against his cock made Usopp moan. The next two had him throwing his head back. Sanji licked him, dragging his tongue up the length of Usopp's dick, lapping at the head. Sanji worked over his dick, his grip on Usopp's legs keeping him still no matter how much Usopp tried to buck and squirm under the ministrations of that hot, wet tongue. Sanji made his way lower, tracing Usopp's balls with his tongue, then lower still, until he could circle Usopp's hole. He licked it, teasing Usopp with his tongue until he was shaking.

Usopp gasped as he worked his way inside, the slick appendage hot and wriggling against his walls. His hands found Sanji's head, scrabbling for a hold in his thick fur. Just when he thought he couldn't take it anymore, Sanji changed targets, returning to lave his dick with long, wet strokes.

Usopp came with a cry, spilling across his lower stomach.

Sanji licked him through it. When he was done, Sanji lapped up the semen. Once Usopp was clean, he leaned up to brush his muzzle against Usopp's lips, an approximation of a chaste but loving peck.

Usopp stroked Sanji's ears as he came down from the high. His body was fever warm, thrumming with pleasure from his orgasm. Sanji gave him time to settle, but it wasn't long before he started touching Usopp, searching out all the sensitive places he knew so well to lick and nip and nuzzle.

Usopp writhed under Sanji's ministrations. He could feel Sanji's cock resting against his stomach. It was stiff and heavy; after all of their foreplay, Sanji's restraint had to be hanging by a thread. Under Sanji's licks and touches, Usopp's cock hadn't softened. After a few minutes he was almost ready to go again.

To get Sanji's attention, he pressed several kisses to his snout. He pushed at Sanji's chest until he caught on and rolled over onto his back. Usopp straddled him.

"You've been such a good boy," Usopp crooned.

Sanji's tail thumped against the bed, as if he was a dog and not a wolf.

"It's time for me to make you feel good."

He gripped Sanji's cock. He gave it a few strong strokes, watching Sanji writhe beneath him, then rose up on his knees. He used his hold to angle Sanji's cock against his hole and slowly sank down on it.

Sanji keened as Usopp enveloped him. His hips bucked, little aborted thrusts as he struggled to keep control.

Usopp let out a quiet moan as he sat on Sanji's cock. The initial slide was easy; they usually had to take more time preparing, but Usopp was ready thanks to his prior preparations, and Sanji's tongue and the orgasm had relaxed him further. He rocked his hips, sinking further and trembling from the delicious stretch. Sanji's cock was big, pushing deep and filling him. It felt so good. The sheer size of it made his body tremble with want, and Usopp loved the feel of it. They both shuddered when he finally bottomed out, his butt resting against Sanji's furry pelvis.

Usopp squirmed on his cock. He was far enough out from his orgasm that he wasn't too sensitive, but the girth of it always took a moment to get used to no matter how ready he was. He waited a beat, adjusting. He could feel Sanji trembling beneath him. Fire lit his belly when he thought about all that restrained desire. He wondered how long it would take to break the control Sanji was barely clinging to.

Usopp rose up once more, pulling off of Sanji's cock until just the head remained inside him. Slowly he sank back down. Sanji groaned long and loud as Usopp moved. Up, down. Up, down. He moved a little faster. Digging his fingers into the fur on Sanji's chest to balance himself, Usopp settled into a rhythm.

Sanji writhed. His moans bordered on howls.

Usopp rode his cock. Thighs burning, he rocked on it, squeezing and grinding occasionally to make Sanji throw his head back. Sanji was a panting, moaning mess beneath him.

"Unh, Usopp," Sanji whined, "my love— mon cher!"

Usopp clenched around Sanji, twisting to grind hard and dirty on Sanji's cock. Sanji howled. He bucked up into Usopp. His large, clawed hands scrabbled for purchase on Usopp's thighs. Finally gripping his hips.

Sanji pushed him up, then yanked him down hard, in the same moment snapping his hips up and driving his cock into Usopp. It was Usopp's turn to howl. That enormous cock hitting every sensitive nerve inside him. Sanji repeated the move again and again. Usopp was seeing spots; his own cock was rock hard, heat and pleasure surging through him.

Sanji growled, clearly frustrated with his lack of leverage. He flipped them.

Usopp landed on his back, Sanji on top of him. Sanji wasted no time. Leaning over Usopp, pressing him into the mattress, he started thrusting. Usopp moaned and writhed, clinging to Sanji's shoulders as Sanji fucked him fast and hard.

Sanji's breath was wet and warm as he panted in Usopp's ear. That enormous cock pounding into his body. Filling him so well. Usopp moaned into Sanji's neck.

The sound of their bodies coming together was muffled by fur, and Usopp's dick dragged against Sanji's stomach with every thrust. He wrapped himself around Sanji, arms around his broad chest, ankles crossed at the base of his spine. Pleasure shot through him. His nerves singing as Sanji rutted into him, the heat of Sanji's body on his inside and out.

"Love you love you love you," Usopp chanted. Holding Sanji and the wolf and Sanji the wolf, squeezing him tight as fireworks went off behind his eyes. Pleasure like fire roared through his veins.

Usopp came with a shout.

He thrashed and moaned, clinging to Sanji as the overwhelming sensations shook him.

Sanji slowed his pace. Gradually stuttering to a halt as Usopp's orgasm came to an end. He tugged at Usopp's limbs, loosening his grip. Sanji pulled out, and in one quick movement, flipped Usopp onto his stomach. Usopp didn't have time to adjust to his new position before Sanji was back over him, hairy chest pressing between his shoulders as he hovered over his body. His massive cock dragged over Usopp's buttcheeks.

Sanji lifted Usopp's hips, forcing him into an arch with his ass in the air. He lined up his cock with Usopp's hole and pushed in.

Usopp moaned when Sanji filled him again, spreading him on his thick cock and reaching even deeper than before. He squirmed, sparks going off before his eyes and under his skin, the feeling of Sanji gently rocking into him nearly too much for his oversensitized body.

Sanji slowly increased the pace, gathering speed and force until he was pounding into Usopp.

So soon after his orgasm, the pace bordered on painful. It was balanced by Sanji's cock striking that perfect spot inside him. Every touch against it sent pleasure like lightning through his body and made Usopp see stars.

Usopp lost himself in the sensations. Sanji fucked him relentlessly, driving all thoughts and sense of time from his mind. Overwhelmed, Usopp almost missed the change. Sanji's pace faltered ever so slightly. His cock stopped reaching quite so deep. Something bumped against Usopp's hole, thick and warm. It took his hazy mind a minute to understand.

Sanji's knot. The swell that occurred when Sanji was about ready to come.

Sanji's grip on his hips tightened. Sanji slowed his thrusts, then stopped. Usopp could feel the knot. It wasn't full yet, but it was large enough already to resist entry.

Something wet dripped on Usopp's ass. He turned his head as best he could to look behind him.

Sanji's head was bent, his jaw open. As Usopp watched, more of his thick drool dripped from his mouth and onto the place where they were connected. For normal humans, spit as lube was a terrible idea. If your significant other was a werewolf, however, the viscous saliva could be used in a pinch.

Sanji pulled Usopp back on his cock. He pressed his knot against his hole. Usopp jerked and squirmed beneath him. He was already stretched wide on Sanji's enormous cock. His body refused to make way for the knot. Though near wild with lust, Sanji took his time; he petted Usopp, cooing encouragement and sweet nothings in his ear. He pressed kisses to Usopp's shoulders and rubbed the rim of Usopp's hole until he relaxed enough for Sanji to move. Slowly, bit by bit, he forced his knot into Usopp.

"That's it, mon cher."

With one last push, the knot slipped inside.

"Ah!" Usopp clenched around the knot. It burned, uncomfortable at first, but he was quickly getting used to it. Sanji's cock felt like it was deeper than ever.

Sanji growled. His thrusts resumed, gaining speed, though the force was lessened thanks to the knot limiting his movements. He pressed Usopp into the bed, grinding into him.

The knot swelled. Usopp could feel it inside him, the fat bulb locking them together, pressing against his nerves. The straining cock buried deep in his body. He squeezed helplessly around it. Pleasure like liquid fire surged through his veins. Sanji was all around him and in him, touching everything, Usopp unable to escape because he was so big and filling him so deep.

Sanji came with a howl.

Hot semen spilled into Usopp. Filling him to the brim, the knot preventing even a drop from escaping.

It was too much. Sanji's cock still twitching inside him, the feeling of his seed filling his insides, the knot holding him in place as he was mated. The mix of pleasure and pain overwhelmed Usopp. His own cock jerked, and his vision whited out as a dry orgasm ripped through him.

They held that pose, pleasure working through their bodies, until the overwhelming sensations gradually abated. Their fast breathing and pulses slowed; a sated languidity replaced desire. Sanji collapsed forward. They both moaned when his movement jostled the knot, sending aftershocks radiating through their sensitive bodies.

Locked together for the foreseeable future, they rolled to lay on their sides. Sanji wrapped around Usopp, snuggling close. Usopp savored the feeling of the knot inside him, holding he and Sanji together and sending little jolts of pleasure through them any time they moved. He basked in the warmth of Sanji's body and the knowledge that Sanji was home, safe and content. He lightly stroked the silvery gray fur on Sanji's arm where it wrapped around Usopp's middle. By morning, the silver would turn blond as the wolf loosened its grip on him. At most, he'd have a day before he returned to being fully human again.

"You feel so lovely, mon cher," Sanji murmured against Usopp's hair. He sounded like he was about to drift off to sleep. "When morning comes, I want to take you again. As many times as our bodies will allow us."

The words sent a thrill of heat through Usopp's worn out body. He wanted that too. Though it would have to wait, because… "Goats."

"They'll be fine." Sanji squeezed Usopp.

"I want to make sure they have enough to eat tomorrow."

"I know you gave them enough food to last all day. Two days, probably."

Usopp shrugged. That was true. Snowstorms made him anxious; he tended to overcompensate.

"They are the most spoiled goats on the planet," Sanji said. "They'll be fine if you stay in bed for one day." Sanji stroked Usopp's front, running a hand over his chest and belly, rubbing in slow, sensual circles until he made it down to his thighs. Usopp shuddered when his paw passed over the faint swell in his belly where the knot protruded, then squirmed when the rough pads on his palm brushed over his spent penis. Hot breath caressed his ear, and Sanji teasingly whispered, "Do I need to convince you?"

"I'm still a bit worried. They might be wanting for company, after all," Usopp said, matching Sanji's tone. "Perhaps I could use a little more convincing."

Usopp felt teeth against his neck. Sanji was grinning.

"With pleasure, my love."

 

Afterword

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