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Steve doesn't have a problem with the fact that Tony likes having one night stands. He doesn't. It's fine. Tony can do whatever he wants with whoever he wants and it's none of Steve's business. It's not.
Until he has to witness Tony making out with Thor on the couch right in front of him.
It's a party — another one of those parties Tony likes to throw after a mission goes well, which usually involves the team, all of their friends from SHIELD, really good music and a lot of alcohol.
And now it involves Tony and Thor, sitting on the couch, kissing. A lot. Enthusiastically. And Steve… Steve's not drunk enough for this. At all.
He doesn't think there's enough Asgardian mead in the universe that could make him drunk enough to be okay with witnessing this.
Thor, on the other hand, is so drunk Steve doesn't know if he's even going to remember this tomorrow morning. But Tony's tolerance is something insane that Steve has never seen before in a regular human being, and he's the one who started the whole thing, sitting next to Thor and touching his thigh, caressing it while flirting with him.
And now they're… Pretty much sticking their tongues down each other's throats — Tony's hand resting on the back of Thor's neck while Thor holds him tight by the waist with both hands. Steve is sitting in an armchair facing the couch, and he doesn't mean to watch but he can't tear his gaze away.
Everybody else seems to be doing a great job ignoring them, but supersoldier hearing is a curse and Steve can hear them over the music — Tony's soft moans, Thor's laughter as they separate just long enough to breathe, the way Thor mutters "you are so gorgeous, Tony" before he dives in again, claiming Tony's mouth and quite literally taking his breath away.
Tony gasps, his hands sliding down to Thor's shoulders, then his exposed biceps, and Tony's fingers dig into the skin of Thor's arms, squeezing, making Thor groan into the kiss.
Steve hates it. It's inappropriate, that's what it is, and it needs to stop. And why does Tony like Thor's arms so much anyway? Steve has nice arms too, and Tony's never touched them like that. Steve wishes he would. God, he wants Tony to kiss him like that. To want him, the way he wants Thor.
And then Thor breaks the kiss and attacks Tony's neck instead, and Tony throws his head back, bearing his throat to him and moaning, and the sound goes straight to Steve's cock.
Fuck.
Tony moans again, louder, like he doesn't care if anybody hears it. Come to think of it, he probably doesn't — it's Tony, after all. But Steve's cock twitches where it's trapped inside his jeans and Steve is mortified. And angry, and jealous — his mind torturing him with images of Tony on his lap grinding down against him and moaning like that.
"Hey, you two, get a room!" Clint yells, and Tony laughs — honest to God laughs and buries his hands in Thor's hair again.
Steve hates it, and he doesn't want to see it, and he can't stop watching it. He wants to be the one to touch Tony like that, he wants Tony to laugh like that with him. Not with Thor, not with anybody else.
He burns with it, with the urge to drag Tony away from Thor, show Tony that he's better, that Tony should be making out with him instead. He wants Tony for himself, his mind conjuring up images of himself covering Tony's body in kisses, touching Tony everywhere, being solely responsible for every single one of the noises Tony makes.
And Steve's cock really likes that idea, apparently. Shit.
"Fuck, you're amazing," Tony says as Thor stops kissing his neck, lifting his head again to find Tony's lips. They kiss, Thor's arms wrapping around Tony trying to pull him even closer, and Tony's breathing heavily, enjoying it way too much for Steve's liking.
"Okay, I'm getting impatient," Tony says when they part again, his hands resting on Thor's chest. "Let's go upstairs, I have a really nice bed."
Thor smiles that dazzling smile that would make any mortal swoon, his hands sliding down to Tony's thighs, caressing them, sliding between them, and Tony shudders.
It shouldn't bother Steve. He shouldn't care. But all rational thought is gone from his mind and all he can think, and all he can feel, is Tony is mine.
Mine. Mine. Mine.
He has to put a stop to this.
Steve stands up, confident that his jeans will hide the fact that he's half hard, and walks towards the couch, so fast neither Tony nor Thor notice him until he's right there in front of them.
And then Tony looks up, right into Steve's eyes, with kiss swollen lips and love bites covering the right side of his neck.
"Um," Tony says, narrowing his eyes at Steve. "We're a little bit busy here, Cap, so if you don't mind—"
Steve grabs Tony by his arm and pulls him up. "We need to talk."
"Captain, we were—" Thor tries to protest, slurring the words a little.
"Doing something very inappropriate," Steve finishes it for him.
"Which is none of your business," Tony says, trying to pull his arm free from Steve's hold and failing. "Fine, we're going upstairs, let me go."
"No. You and I are going to talk first," Steve insists. "Come on."
Tony lets Steve lead him away, but only after sighing in frustration and telling Thor not to worry and that he'll be back. Steve takes Tony to the workshop — the nearest room where they'll be able to talk without loud music playing, since Tony's workshop is soundproof.
And Tony must have caught on, because as soon as Steve closes the door behind them Tony jerks his arm free, turning to look at Steve, and doesn't make any attempt to keep his voice low.
"Alright, what the fuck does this mean, Cap? I was gonna get laid."
Tony's words only make Steve's insides twist with jealousy even more. "Are you serious, Tony?"
"Yeah, I'm serious, and you—" Tony pokes Steve's chest with his finger, "—better have a good fucking reason for cockblocking me!"
Steve bats Tony's hand away, breathing hard. "What you and Thor were doing is highly inappropriate, Tony, isn't that a good enough reason?"
"Yeah, that's why we were gonna take it upstairs," Tony says. "Thanks for ruining what was gonna be a great fuck."
Steve can't tell Tony that the idea of watching him and Thor going upstairs together is even worse than watching them making out on the couch. Instead, he says, "it's not okay for you to do that in front of the team!"
Tony narrows his eyes at him again, but this time it's different — Tony looks like he's finally understood something.
"Why not, Cap? Are you jealous?"
"Stop it."
Tony smiles a naughty smile that means he found out exactly what he wanted to know. He takes a step closer to Steve, and Steve takes a step back. "Why, you wanna make out with him?"
"No," Steve says firmly, taking another step back, realizing how close to the workshop's glass doors he is.
"Oh?" Tony raises an eyebrow. "You wanna make out with me, then?"
Steve swallows hard, unable to answer fast enough.
Tony's smile is gone — he stares at Steve in total perplexity. "Holy shit, you wanna make out with me."
It's not a question.
"Tony…" is all Steve can say.
"You're not saying no." Tony laughs like he can't believe it. "Oh my god, you're jealous. You're jealous because you want me."
"Stop it, Tony," Steve manages to say, his heart pounding in his chest. "You're drunk."
"Yeah," Tony says, a smile still on his face, taking another step closer, and Steve has nowhere to run. "So are you, Cap."
Tony reaches for him, wrapping both arms around Steve's neck and pulling him down for a kiss.
If Steve were a stronger man, he would stop Tony. Pull away, tell him they can talk another time when they don't have any alcohol or Asgardian mead in their systems. Instead, Steve kisses back, his tongue making its way into Tony's mouth as Steve grabs Tony by the waist, turns them around and presses Tony against the reinforced glass door instead.
Tony moans, and yeah, Steve really likes that. He slides his hands down to Tony's ass, squeezing as he pulls Tony even closer, swallowing the desperate noises Tony makes. They grind into each other, and oh god, this is the kind of stuff teenagers do, isn't it, but it feels so good Steve just can't stop.
Apparently, neither can Tony.
"Fuck, Cap," Tony pants against Steve's lips as he pulls back just to breathe, his nails grazing the skin on the back of Steve's neck and sending a shiver down Steve's spine that somehow just makes his cock throb in his pants. Then Tony's hands move down to Steve's chest, caressing and squeezing a little before they slide down Steve's stomach, getting dangerously close to where Steve really needs them to be.
"Tony," Steve half says, half moans his name as he claims Tony's mouth again, Tony's hands working quickly to get both of their cocks out, and they probably shouldn't be doing this against a glass door that anyone could see through if they decided to come looking for them, but if he didn't have enough willpower to stop earlier, he definitely doesn't have any now.
And then Tony moans again as their cocks touch, and Steve wouldn't be able to stop now even if he wanted to.
Tony breaks the kiss, just enough to lick his hand and make it wet and slick, and god, it's so good. Steve shudders, his cock throbbing against Tony's, in Tony's grip, and it's Tony, for God's sake, it's all he wanted all along, all he needs.
Steve leans in to kiss Tony again and loses himself in that perfect mouth, and he knows this is not going to last — he's so turned on by Tony's moans and the urgency in them; the urgency in the movements of Tony's hands and hips, in the way Tony kisses him like he's desperate for him, for more.
Steve moves from Tony's lips to his neck, wanting to give Tony time to properly breathe but unable to keep his mouth off of him, wanting to leave his own love bites, his own marks Tony will remember him by in the morning.
"Cap— Steve— fuck," Tony says, trembling in Steve's arms. Steve bites his neck again, just a little harder, and Tony's helpless moan has him right on the edge.
Steve lifts his head to look at Tony, then presses their foreheads together. "Tony, ah— I'm so close," he whispers, his hands squeezing Tony's ass even tighter.
He wishes he could have more than this, that he could have Tony naked, that he had time to explore his body, find out everything that Tony likes.
"Me too," Tony says, closing his eyes and breathing hard against Steve's mouth. "God, Steve—"
"Yeah," Steve says, barely holding on. And then Tony twists his hand a certain way that has Steve having to lean on him to keep himself upright. "Oh, Tony, oh—" Steve can't help the noise that escapes his throat as he comes all over Tony's hand, all over their cocks, and Tony keeps stroking them, milking every single drop out of Steve even when Steve is trying to catch his breath.
But then Tony's coming too and all his thoughts vanish from his mind and the only thing he can do is feel.
It's perfect, it's messy, it's wrong and so right, and Steve squirms as Tony touches the head of his oversensitive cock. He rests his forehead on Tony's shoulder and breathes in, and Tony smells like alcohol and coffee and sex, and Steve wants this, he wants Tony — he wants Tony like he's never wanted anything in his life.
Okay, they're going to have to talk about this, he thinks, because now there's no way he can just go back to the way things were before this. For now, he kisses Tony again, drunk on him, on his mouth and his moans and his body.
And the amazing thing is that Tony responds with the same enthusiasm, like he wants to get lost in this just as much as Steve does, and for a moment, Steve allows himself to hope.
_____
After getting cleaned up as much as they can in the workshop bathroom, they go back to the party, trying to look natural and like all they did was have a normal, albeit quite long conversation.
But nobody seems to care much about where they were, or the reason why they were gone for a while.
Thor is still on the same spot on the couch, but he's not waiting for Tony like Tony seemed to expect him to — in fact, he's now making out with Bruce, and seems very satisfied with it.
Steve shoots Tony a glance, worried that Tony's upset, but Tony just shrugs.
"Oh, well," Tony says. "I'm glad Bruce is finally having some fun." He looks at Steve again and smiles. "Wanna grab a drink?"
Steve smiles too, his heart beating fast in his chest. "Yeah."