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"You like acting alpha, baby?" Tony growls, pushing Steve down to the bed with one hand between his shoulder blades. "You like shouting orders, telling me what to do on the field, then coming back here and getting drunk on my cock? Yeah?"
"Yeah," Steve moans, fingers twisting in the sheets, almost out of his mind with want as Tony pounds him into the mattress, all his intelligence abandoned for this animalistic pleasure. All of Steve's pride went out the window as soon as they got back and Tony shoved him against the wall with one knee between his thighs, smelling aggressive and possessive and alpha. By the time Tony stripped him out of his uniform, Steve's pants were soaked through with his own slick, dripping down the insides of his thighs and making him feel dirty and needy. "Oh god, Tony, fuck, oh oh--"
"Wonder what the team would say if they saw you now," Tony teases harshly. "Captain America, who everyone in the country thinks is an alpha, soaked in his own precome and slick, stuffed with my cock. What are you, Steve?"
"Your omega," Steve cries, drooling and crying into the mattress. This is what his body was made for, to suck and squeeze Tony's cock and milk every drop of come from him. Every stroke of Tony's thick cock in and out of his body is driving him closer to the edge, and if he's already this delirious just from smelling Tony and being full of his cock, he can't imagine what the high of Tony's knot and come will be like.
"And what am I?" Tony demands.
"My alpha!"
"Good," Tony says, reaching down and wrapping one hand around Steve's throat to bring him up, his back against Tony's chest as his head falls limp back onto Tony's shoulder, baring his neck. The sound of Tony's hips slapping against Steve's ass and Tony thrusting relentlessly into him is even louder in this position, making Steve more exposed and vulnerable to Tony than ever, and when Tony bares his teeth to bite down on his gland, Steve lets out a loud whine and his eyes roll back in his head.
"Tony, Tony--"
Tony lets up on the bite and sucks on it instead like he wants to bruise it, sending shocks of pleasure pain up Steve's spine.
"Are those the only words you know?" Tony grunts. "Alpha and Tony?"
Steve sobs and nods because what else does he need to know, besides this? Tony seems satisfied because he licks over the swollen gland on his neck and Steve shudders with a spurt of precome. He's practically forgotten his own name, he couldn't even tell left from right or up from down anymore, all he knows is Tony.
"You little knotsucker," Tony groans when he sees the pearly precome on Steve's abs, thumbing at it and then shoving it in Steve's mouth for him to taste himself. "Fuck, Steve, I could eat you alive, I wanna knot you and knock you up and make you mine fucking forever--"
"Yes," Steve whines around Tony's thumb. Tony is right. He is a knotsucker, always wanting Tony's cock, begging for his knot, so desperate he's incoherent. "Already yours, we're together, knot me, keep me, I want your pups--"
"Your body feels like heaven," Tony whispers in his ear, and then Steve feels the swelling start at the base of Tony's cock as Tony fucks him with the knot until it's just too big to pull out without hurting him, and he just stretches Steve out like that. Steve can barely hear himself, but he knows he's being loud and grabbing for Tony. "Oh, fuck, there we go, baby, that's what you wanted?"
Steve whimpers as Tony's knot fills him up, and Tony gently guides them to lay down on the bed. Steve is dizzy already, but he knows what will really get him drunk is Tony's come. Tony thrusts shallowly inside him a few times and then his grip is tightening around Steve's body, gushing hot into him as he makes the headiest sounds from the back of his throat. And then Steve is just floating, full of pleasure and the smell of Tony as they catch their breaths.
"There," Tony murmurs. "You just be this. Just my omega, be taken care of, you don't have to think about anything when we're like this, ok baby?"
Steve nods, feeling perfect and filthy and content to be there in Tony's arms, and he drifts off happily as Tony strokes his hair and talks sweet nothings to him.