Work Text:
Bucky had wanted to try it for a while, and by it, he meant something dirty, something that made even him blush. The idea had always been in the back of his mind, niggling at him when he’d been in bed with his partners, but he’d never been brave enough to ask for what he wanted because he thought his partners would think he was weird.
But he’d been with Tony for a while now, and they’d both been open about their kinks, but this one—what Bucky wanted—seemed wrong like it made him sick for wanting it.
And what he wanted was simple, he wanted Tony to piss in his ass, either with a funnel or by letting himself go inside. Bucky wanted to feel his hot piss filling him up, seeping into him, and making him feel marked, claimed, and used.
They’d been together for nearly two years, but this was something different, and Bucky wondered if it was too different. He didn’t think Tony would judge him, but maybe he was judging himself. He wanted it to be dirty, he wanted to be Tony’s urinal, but he had no idea how to ask for that.
What kind of person got off on having someone piss inside them?
He’d discovered the kink by accident, seeing a video of a man, down on all fours with his ass in the air, with a funnel stuck inside him. It had been intriguing, and he ended up revisiting the video more than once.
He dreamed about what it might feel like to have someone use him like that, to feel hot piss splash on him, filling a funnel, filling him. He wanted to know what it felt like to feel the warmth seep into his guts, taking whatever his partner gave him.
And it wasn’t just that. Bucky wanted the challenge of holding it inside afterward until he couldn’t anymore, like a piss enema. He wanted to know if his normally smooth belly would plump under the liquid weight of the urine.
Fuck, maybe there was something wrong with him. Maybe somewhere in his life, his wires had been crossed. The one thing he did know was that there was no way he could tell Tony about this. It would just have to remain a fantasy.
Two months later, though, that choice to keep it a secret was ripped away when Tony came up behind him in the kitchen, leaning on the counter and giving him a curious look.
“Whatcha making?” Tony asked, leaning over to look in the bowl Bucky had in front of him.
Bucky dumped in the blueberries and started folding them into the batter. “Blueberry muffins.”
“And what did I do to deserve those?”
Bucky turned, giving Tony’s nose a peck. “Ain’t just being adorable enough?”
Tony just hummed, then went to the cupboard, getting Bucky’s water bottle he normally used for the gym. The bottle was huge and held over a liter. Tony filled it up, then went back to watching Bucky. There was something a little off about him, but Bucky couldn’t put his finger on what. He seemed a little distant, lost in his head.
“Everything alright, babe?” Bucky asked, spooning the batter into the tin. He double-checked the oven to make sure it was up to temp.
“Just thinking.”
“About?”
“I fixed your tablet,” Tony said, sipping his water. “It was… enlightening.”
Bucky frowned, putting the muffin tin in the oven. He set the timer and turned to Tony. “Enlightening?”
Tony hummed. “You didn’t clear your browser history last night. I thought I taught you better than that.”
Something clenched tightly around Bucky's heart as his stomach took a dip, making him feel like he was on a rollercoaster. His face was probably doing some funny things as he tried to remember just what videos he’d been watching last night. He sagged against the counter as he remembered the one. It had been one of the funnel videos.
Mouth dry, he croaked, “Oh, um, I didn’t—shit.”
Tony took pity on him, setting the enormous water bottle down and walking over to him. He put his hands on Bucky’s arms, trying to catch his gaze. “Look at me, sweetheart.”
Bucky really didn’t want to. In fact, he wanted the ground to open up and swallow him whole. Embarrassed didn’t begin to cover his current state. “Do you think I’m gross?” he asked, voice small.
Tony just gave him that look, the one that was soft and exasperated at the same time, like he was trying to be comforting and patient, even though he wanted to knock some sense into Bucky. “Why would I think that?”
Bucky could feel the blush spreading up his neck. He averted his eyes, looking down at the tile floor. “Because it’s gross. I want—it doesn’t matter. It’s nothing we’re doing.”
“And why the fuck not?” Tony asked. “How do you know I’m not into it, too?”
Bucky sighed, trying to push away from Tony. “Because I know you, and you’ve never acted interested before.”
“Well, in my defense, neither have you. I only found out by accident, and after rolling the idea around, I think it’s kinda hot—using you like that. That’s what you like, isn’t it? Being used and filled up like a human urinal?”
Bucky’s dick started to chub up, despite how awkward he’d felt moments ago.
He met Tony’s gaze for a moment. “You don’t have to do this for me. I know it’s weird.”
“Then I’m weird, too, because I want it. Why do you think I’m drinking water?”
Bucky’s brows came together, and he eyed the water bottle. “I thought it was weird you were hydrating. Since last time I told you to drink water, you informed me coffee was brown water and counted the same.”
Tony grinned, then leaned in to give him a kiss. “Finish cleaning up the kitchen. I have water to drink.”
Bucky spent the rest of the day thinking about Tony and what he had planned.
Did they have a funnel, or was Tony going to piss inside him? The anticipation had him in knots, not knowing what would happen.
That evening, Bucky prepped himself during his shower, getting ready for Tony. Then he met Tony in their bedroom, only wearing a towel around his waist. Tony still had his ridiculous water bottle, but it was nearly empty. Bucky wondered how many bottles he’d drank. Silently musing to himself that maybe this was the key to getting Tony to be healthier.
Things started like usual, kissing and touching in a way that came with familiarity, and soon, Bucky had his ass propped on pillows, face down, as Tony worked him open with calloused fingers. When he was loose and needy, Tony slicked himself up and pressed the blunt head of his cock to Bucky’s asshole and pushed inside, drawing a guttural moan from Bucky.
Tony fucked him slowly for a few minutes before speeding up, getting lost in it. It was a rhythm they knew well. Then, as Bucky started to clutch at the sheets, feeling the heat pool in his groin, Tony pulled out and came on Bucky’s ass with a grunt.
Bucky sagged against the bed, resting his sweaty head against the sheets as he caught his breath. He felt bereft without Tony filling him up, but the thought that Tony might be pissing inside him soon, using him, made up for it.
Tony moved off the bed, then returned with a wipe, cleaning the mess off Bucky. Then he took Bucky's hand, saying, “Come on, I need to piss like a racehorse.”
Bucky followed Tony into the bathroom, where Tony directed him to climb into the tub.
“Head down, ass up, sweet cheeks.” Tony slapped his ass, then opened the cupboard and pulled out a funnel.
Bucky’s eyes went wide, and he licked his lips, giving his cock a stroke. He scrambled to his knees, then got in position. His muscles were trembling as he tried to hold still.
Hanging his head, he didn’t see Tony approach, but he heard him. Then he felt his hands on his back, along with the edge of something hard and plastic. The funnel.
His fantasy was really happening, and he didn’t know how to process it. It felt surreal, too much yet not enough. Everything felt like it was in fast-forward one minute and slow motion the next.
“I’m just gonna …” Tony trailed off, then he felt the tip of the funnel at his asshole, pushing inside. The leftover lube from their earlier encounter was enough to ease the slide.
Bucky tried glancing back over his shoulder but couldn’t really see. He dropped his head, resting it on his forearms, feeling his cock leaking between his legs. “Please,” he whined. “Give it to me, Tony.”
“I gotcha, sweetheart. Look at you, such a filthy little thing, letting me do this. And I mean, I really want to see this, watch it fill you up. Bet you’ll take it so good.”
Bucky couldn’t help it. He had to reach down and grab his cock, giving himself a few strokes. This was going to be over fast. Squeezing the base of his dick to stave off an orgasm, he said, “I’m ready. Come on, babe.”
Tony chuckled, moving closer. “Jesus, you’re so needy. Don’t worry, sweetie. I’m gonna give it to you.”
Bucky heard the piss hitting the funnel before he felt it. Little droplets splashed out and onto his thighs, dribbling down toward his balls. Then the hot piss started filling him, seeping inside, and Bucky whined low in his throat. It felt hot inside him, then as it worked into his guts, his belly cramped a little.
Tony had to stop and start a few times, occasionally pausing to wiggle the funnel.
“Fuck,” Tony breathed, and Bucky had to bite his lip, squeezing his eyes shut. It was almost too good, too much. “Look at you, pulling it in. You better be a good boy and not lose a drop. I want you to hold this.”
Bucky could feel it pooling inside him, then suddenly, Tony was pissing again, putting more into the funnel. It drew a moan from Bucky. He felt so filthy, utterly debauched, and he loved it.
Tony jiggled the funnel again, spilling a little on his ass and legs, and he tried to shift himself a bit, lift his hips, so it would flow into him better. The spots where the piss had splashed on his skin were cooling, making goosebumps chase over him.
Finally, after minutes of filling and draining the funnel, Tony seemed to be done.
“Jesus, you took it all,” Tony said. “I wish you could see yourself like this. Fucking filthy little boy. I can see inside you right now, see my piss draining deeper into you.”
Whimpering, he started jerking himself off, feeling the piss heavy in his gut. It was deep inside him, marking him up. As he worked his hand over his cock, his belly cramped a little around the liquid. It wasn’t going to be easy to hold onto it.
Tony smoothed a hand over Bucky’s flank. “Talk to me, Buck. Tell me how it feels. Does it feel good to be my urinal? Can you feel it inside you—working through your guts?”
“Fuck,” Bucky breathed. “It’s so good—so good. I want it everywhere—deep inside me.”
“I can’t even see it anymore—that’s how far it’s in. I could see it before—pooled in you, but now it’s worked all the way in.”
He worked his hand over his dick faster, his balls drawing up tight, his body feeling so full, belly weighted by the fluid. The heat pooled in his gut, then Tony started tugging at the funnel, fucking him with it.
And that was all it took, the final push. Bucky came so hard his vision whited out, and he nearly collapsed in the tub.
Breathing heavily, he sagged against his arms, ass still in the air. As the aftershocks of his orgasm faded, Tony pulled the funnel free, the hard plastic scraping his tender skin a little.
Tony’s hand smoothed up and down his back, over his sweaty skin. “You still want to try and hold it?”
Bucky’s belly cramped a little, and he had to squeeze to keep the piss inside. He didn’t think he’d last once he stood up. “I’m not sure I can.”
Humming, Tony teased a finger over his hole, making him jump. “Well, you don’t need to worry about me thinking you’re weird anymore. Because this—this was pretty fucking hot, and is it wrong I’m enjoying watching you struggle a little?”
His breaths were coming in light pants as he tried to keep from pushing out the piss and whatever else came with it. “You’re an ass.”
“Correction—you’re my ass.”
Bucky chuckled, then it turned into a groan as his belly cramped. “I think we’ll have to play with this idea again, but I can’t hold this anymore, babe. I’m fucking sweating.”
The tip of a finger just breached his hole, nearly making him lose control. He could just imagine the grin on Tony’s face. “Can you make it to the toilet?”
“Yeah, I think.” Then he pushed himself up onto his knees, feeling the piss shift inside him. Looking down at his belly, he could see he looked bloated.
“Up we go,” Tony said, getting an arm around him. He guided Bucky to the toilet, who had to pinch his ass cheeks together as he walked just to keep everything inside.
Bucky turned to Tony before sitting. “I think I got it from here.”
“You had enough kink exploration for one night?”
Huffing, Bucky clutched a hand to his piss-distended belly. “Something like that, babe.”
Tony leaned in, catching his lips in a quick kiss, then with a pat to Bucky’s belly and a little chuckle to himself, he left the bathroom.
Bucky all but fell onto the toilet.
He’d need a shower after this, but any mess was worth it. This had been everything he’d wanted and more. And if Tony wanted to explore some more kinks in the future, he was totally game.