Cheating/affair request Tony is unhappily married to pepper, one day pepper's little (slutty) little brother came to stay for a while. Tony cheats on pepper with peter.
Oof! How dare you give me such a good prompt nonnie 😂 - I pictured tony as 40-45 and Peter as around 18, but its never specified :) Also I decided on a no powers universe - there’s still Stark Industries and Stark tower, but no IronMan or Spiderman
Word Count: 1600 - do I want to write more? YES! Did I have to restrain myself, and even then go a little overboard anyway? YES
Tony knew Pepper had a younger half brother, one that she only knew because of obligatory shared Christmases and family events, ones that she hadn’t been to in a few years. However, when she said that her father reached out and asked to let Peter stay with them for a few months while he went through *another* divorce, Pepper said yes. She had gone through that once before with the same father and felt bad for the kid. She didn’t say much to Tony about it, which caused another problem with their relationship, but he got over it when the boy walked into the penthouse. Tony has to do a double-take from where he’s sitting on the couch, because this kid looks like someone he would have hired for the night back when he was a playboy. Back before Pepper. The boy meets his eyes, and Tony rushes to stand and greet him.
“You must be Peter,” he says smoothly, despite losing his breath just from looking at the boy. He holds his hand out for the boy to shake.
“Yes, Sir. It's a pleasure to be here. Thanks for letting me stay for a while!” He says, and he’s so sweet, but when he’s dressed in tiny little shorts and a crop top, it gives Tony thoughts he should not have.
“No worries, the more the merrier right?” Peter gives him a shy smile at that. “Pepper is finishing up some work in the office,” the like usual is unsaid, but still leaves a bad taste in Tony’s mouth. “It's getting late, did you want something in particular for dinner?”
“Call me Tony, please,” he rolls his eyes slightly, and reaches to grab one of Peter’s duffle bags, “Follow me, you can get settled into your room before dinner, clean up if you want to.” Tony wants to watch the boy clean up. Which, where did that thought come from? This boy shares DNA with his wife.
“Thanks, Tony,” and the boy follows him into the spare room, which before Peter arrived, was the room Tony was staying in to avoid Pepper. Tony wants to stay in this room even more now that there’s a pretty boy in it.
“Well, I’ll leave you to it. If you have any questions, I’ll be in the lounge.”
Peter blushes again, and Tony leaves, breathing heavily outside of his closed door. Too inappropriate. No matter how unhappy Tony is, he is not going to cheat on Pepper with her little brother. Half-brother, his mind supplies happily. No, he won’t do it.
When Peter comes out from having a shower, Tony can't believe his eyes. He’s wearing an oversized shirt and the tiniest little shorts he can see when Peter leans up to stretch.
“Feel better? Pepper called and said she’s going to be a bit late, so it's just us for dinner tonight, sorry,” he says, but he isn’t really. Any time he gets to spend with this angel instead of his wife is way better.
“Oh, that’s okay!” They decide on Chinese, and after watching a movie (star wars - apparently the kid is a huge nerd which turns Tony on so much Tony finds really interesting), they sit on the couch and keep getting to know each other. He finds out that the boy wants to study at NYU so he’s thinking of visiting the campus, which Tony thinks is a great idea, and is already thinking of giving the boy a credit card so he can easily go anywhere in the city (and buy anything he wants with Tony’s money - he’s never wanted to be a sugar daddy, but he can see the appeal right now). They’re interrupted by the elevator opening, and Pepper walking out, typing quickly on her phone. Tony stands up and greets her, pretending to act happy. They decided that while the boy stays with them, it would be best to act civil and still together, just like they do for public appearances - he doesn’t need to stay with another couple in the midst of a divorce. He goes in for a kiss, and Pepper turns her head quickly to the side. Tony’s had enough awkward interactions to recover quickly and press a kiss to her cheek instead, unbeknownst to him that Peter is very smart indeed, and noticed the coldness straight away.
“How was work?” Tony asks. He tries to remember what he and Pepper talked about when they were still happy, and finds he can’t.
“Stressful, like normal,” he can almost hear the eye roll, and she pockets the phone, “Peter, how are you? I haven’t seen you in years. Look at you all grown up!” Peter rushes over to her and hugs her tightly, which Tony thinks is sweet. It reminds him of the dreams, of a child, of him and Pepper as parents. Maybe in another life, they would’ve had this. Except without all of Tony’s inappropriate feelings. He decides to go for a shower while Pepper catches up with Peter.
If he fists his cock and moans loudly while the water cascades around him and drowns out any noise, well no one has to know.
Tony really should have known that the teenage boy would stay up late. He can’t sleep, like normal - He can’t stand sharing a room with Pepper and acting like everything is fine, and was on his way to the lab. He has to walk past Peter’s room to get to the lounge and into the elevator, and hears talking coming from his room. Although New York is only a few hours behind, it makes sense for Peter to be calling someone who still lived in Los Angeles, and okay yeah, maybe he’s bad for eavesdropping but he can’t help it.
“No, I’m telling you Ned, they are not a couple!” He hears the pause, and assumes the person on the other end is replying - he can’t hear them through the door. “No! They definitely don’t like each other, feel kinda bad that they have to pretend that they like each other for me.” _ “Yes, I know.” _ “I know its good, maybe I can convince Tony to sleep with me.”
Peter starts to chuckle, but Tony isn’t laughing. In fact, he’s barely breathing. Oh god.
“I’ve been acting pretty sweet - need Pepper to trust me enough to leave me alone with Tony.” There's giggling again, like little schoolboys and fuck, he’s reminded of how young Peter is. “I don’t know if they’re newly broken up or not, but like, surely I can entice him to sleep with me with my ass right?” _ “You’re my best friend man, you’re meant to encourage me to go for my dreams!” _ “Excuse me, my dreams definitely include Tony’s cock,” more giggles but Tony thinks he’s going to pass out, “How big do you think he is? I know we’ve had this conversation before but it's different when you see him in real life. He was in sweatpants tonight, and I was trying to get a look, but I couldn’t really make it out,” he seems sad, and Tony wants to burst in there and shove his cock in the boy’s, shit he thought he was so innocent, he’s probably not even a virgin, face. But he steadies himself and continues on his way. He will definitely not be getting any sleep tonight.
Tony is woken up by something wet and hot engulfing his hard dick. Shit, feels so good. Except, him and Pepper haven’t done anything like this in a long time. Maybe she’s getting possessive, jealous because Peter’s here now and he’s so much prettier then… His dick pulses when he thinks of Peter, but his eyes shoot open anyway. Because he only went to bed when Pepper left for work, and there's only one way his dick is feeling this good. He flicks the covers up to see Peter, shit his eyes roll back, sucking his dick like a well-trained slut. “Fuck Pete” he groans.
Peter pulls off his cock and grabs it with both hands. “Mr Stark,” he croaks out, “Never knew you would be this big. Dreamed about it, but never thought…” he’s distracted by going down on him again, trying to suck him to the bottom.
“Shit!” Tony bucks up into his mouth, he can’t help it, and keeps fucking the kid's throat until he groans out “I’m gonna cum kid, fuck Pete Pete-“ and the kid sucks harder and Tony’s spilling down his throat. His eyes roll back into his head and his elbows give out so he collapses onto the bed and he hasn’t cum that hard in years, shit, and he just did it in Peppers little brother’s mouth. His brain tries to tell him ‘half-brother’ again, but his cock only twitches valiantly in Peter’s mouth, who smirks and pulls off with a pop.
He’s leaning his head of Tony’s thigh now, looking up at him with admiration. Tony meets his eyes, groans, and then reaches for under his armpits. “Come up here kid.” and manhandles him until Peter’s dick is in his throat and he’s sitting on Tony’s face and all he can smell is Peter. It doesn't take long for Peter to come, so easily like a fucking teenager, because he is one, and seems embarrassed when Tony pulls him off and lays him down next to him, but Tony just groans and licks into his mouth.
“Why’d you act so innocent yesterday when you’re really just a little slut? Huh? Seducing me in the bed I share with my wife, with your sister.”
The boy moans, eyes still half-closed, “I don’t know Mr Stark, had to see if you would want me.”
“God kid, I could barely resist last night.”
“Wish you didn’t. Cleaned up in the shower like you told me too, I had three fingers in there hoping you would take me. Wanted your cock for dinner last night instead.”
Tony groans, his cock half-hard again, and a quick glance down shows Peter fully hard.
“I’ll make it up to you, baby.” and then he rolls over onto him, sealing their mouths in a messy, filthy kiss.
