I think I'll start to summarise what happens before I start the chapter, so if you don't like what's going to happen, you can skip it.

Tony is in a relationship with Steve, and Peter helps him leave it.

Peter's POV:

I started to walk down to Tony's lab. He had asked to me to come over for a lab day, which was weird. He generally doesn't spend much time with me now, now that he's got Steve.

That probably came out as really jealous. But, that's the thing. I am jealous, of Captain Bloody America. I don't know what happened, but a few months ago, I discovered I was in love with Tony Stark. I'm starting to sincerely regret it. 

It's not easy to fall in love with a billionaire who will never see you in that way. But somehow, through Parker luck, I managed it. Boy, did I manage it. Let's just say, I am completely and utterly whipped  for Tony Stark. 

As I neared the lab, I heard music blasting really loudly. And I saw Tony dancing and singing to it. He was putting a lot of effort into it, so I decided to stand there, and enjoy it. He's pretty oblivious. 

So look me in the eyes
Tell me what you see
Perfect paradise
Tearing at the seams
I wish I could escape
I don't wanna fake it
Wish I could erase it
Make your heart believe

But I'm a bad liar, bad liar
Now you know
Now you know
That I'm a bad liar, bad liar
Now you know, you're free to go

It was beautiful.

Tony's POV:

So look me in the eyes
Tell me what you see
Perfect paradise
Tearing at the seams
I wish I could escape
I don't wanna fake it
Wish I could erase it
Make your heart believe

But I'm a bad liar, bad liar
Now you know
Now you know
That I'm a bad liar, bad liar
Now you know, you're free to go

I don't think I had ever belted out lyrics so hard. But, every single word ran true. 

I was dating Steve, but something, someone just feel right. Because, very sadly, I had fallen deeply and irrevocably in love with Peter. There was something so wrong with me, something so paedophilic about me, because I had fallen for the kid. 

Well. I say "kid" but, to be fair, he was twenty. But still. I shouldn't be thinking about it, it's wrong. 

"Hey, Tony. Nice song, nicer dance," I heard from behind me, and my blood ran cold. 

"Pete? What are you doing here so early?" I said, slightly panicking. He just grinned, and said, "You singing about a certain someone?" with a bloody WINK.

Peter's POV:

"Maybe. What's to you, kid? You're generally not so invested in my relationships," I heard my mentor ask. I knew he had been singing that song about Steve. It was just obvious, but suddenly, a great idea occurred to me. 

"No, I'm not. But given that you were singing that about Steve, and you obviously want to end the relationship, I think I could help you in that area," I muttered, sweating like a pig.

"Oh? How?" Tony asked, clearly intrigued.

"Follow me. We're gonna end this relationship, in style." I grinned, and led Tony upstairs to the common room.

~*Time skip with Mjolnir (what a sexy hammer)*~ 

I was actually terrified. I led Tony to Steve, and my mentor asked, "Pete? What are you doing?" whilst I was positioning myself very close to him. 

"Trust me," I breathed, and then I promptly kissed him.

Tony's POV:

This kiss actually came out of nowhere. I mean, I wasn't complaining, but wow. It was an incredible kiss, it had me melting. 

I groaned, and pulled Pete closer. This was all I had ever wanted, it was divine-

"TONY! PETER! WHAT THE ACTUAL FUCK?" I heard from my enraged boyfriend, or I suppose ex-boyfriend now. 

I grinned against Pete's lips, turned around, and said, "Language, Cap.".

What did you think? It was overly crappy, but I just wanted to shame Steve, tbh.