A/N: Hi! This is my first Avengers and Spider-Man crossover. I'm so nervous! This fic takes place after the first Avengers movie (I haven't watched Age of Ultron yet) and TASM2 but Gwen is alive and Peter is in his last year of high school.

I'm looking for a Beta'd because English is not my first language and I would like someone to correct my mistakes . If you are interested send me a PM, please.

Leave reviews if you like the fic and enjoy!

Gwen stepped into the elevator. She had to go to the floor 15 to give the results of some analysises to Dr. Boone. She was still working at Oscorp just to know if more ilegal experiments were being realized, not because she liked the place. She didn't want something like the Lizard incident to happen again, it was the only way she had of honoring the memory of his father. The elevator doors opened but the floor wasn't the one Gwen had wanted to go. I must have pressed the wrong button she thought. Suddenly, she heard a loud noise, as if something had broken, and a piercing scream. After that, a scientist came out of the room at the end of the halfway, run to the elevator and pressed the button to the floor 25.

-What happened in that room?-Gwen asked him after the doors were closed.

The scientist flinched when he heard her as if he hadn't realised she was there.

-Nothing important-he said looking very distressed.

The elevator reached the floor 25 and the scientist left running. After checking there wasn't anyone nearby, Gwen got his cellphone out of the pocket of her jacket and marked a number she knew by heart.

-Peter? It's Gwen. Something weird is happening at Oscorp.

Something weird is happening at Oscorp. That sentence had raised more red flags in Peter's brain than his spider sense. He didn't know why that company hadn't been closed yet, there had been enough incidents to consider Oscorp dangerous (no one knew it as well as Peter). But it was still open and now he had to sneak through a ventilation duct in the rooftop of the building to know whatever Oscorp was up to. My idea of a perfect night he thought sarcastically. He crawled through the ventilation duct until he reached the basement. When Peter came out his Spider-man suit was covered in dust. They could clean this more often. According to Gwen, the noise had come from the last room to the right. He was about to open the door when he heard an explosion in the upper floor. Peter looked at the door doubting whether opening it or going to the upper floor and seeing what was going on. Maybe it's not something important he thought. But then he heard another explosion and ran upstairs.

Some guards had their guns pointed at something in the center of the room. There were so many guards that Peter couldn't see anything so he climbed up the wall. Surprisingly, none of the guards saw Spider-Man, they were too focused on...Iron Man? Well, Peter didn't know another person who wore that eccentric red and gold armor so it must be him. The superhero had his hands raised and was saying:

-C'mon guys, you shouldn't do this. I'm going to win and you know it.

What people say about his ego is true Peter thought.

-Don't move!-one of the guards shouted.

-Well, I'm really enjoying this but I'm late and my beautiful girlfriend is waiting for me at home so I should get going.

Iron Man knocked out a pair of the guards using the repulsors in his hands. The others shot him but the bullets didn't make even a scratch to his armor. It looks like he's handling it very well Peter thought. I better go downstairs again before anyone sees me. But then another guy came into the room with a weapon that looked like a giant machine gun. The guard aimed and, before Peter could stop him, shot at Iron Man who broke through the wall. Peter lowered to the ground swiftly and shot his webs to the guard pinning him to the wall. His Spider-sense warned him that someone was behind him so he turned to see a guard pointing at him with the strange weapon. He shot but Peter dodged the...laser. It shoots lasers, this night is getting better for moments. Before he could stand up the guard was pointing at him again and Peter knew that he wouldn't be able to escape. Fortunately, Iron Man appeared and punched the guard in the face. After that, he grabbed the weapon and said to the guards:

-Don't move or I'll have to use this against you. And I know by my own experience that it hurts a lot.

-And throw your guns before I web you to the walls like I did to your friends-Peter said signaling the guards who were still trying to get rid of the webs.

-So you're Spider-Man. A pleasure to meet you though I'd have preferred other circumstances.

-Given our lifestyle, what did you expect?

Iron Man chuckled and said:

-You're right, I...

In that moment an alarm sounded in the building, interrupting him. Iron Man opened a hole in the wall with his repulsors and said:

-We should go. I don't want to stay here all night taking these idiots down.

-I feel the same.

Iron Man took off flying and Peter swung from building to building. He followed Iron Man until he stopped in an alley where a blond man with blue eyes was standing. Peter found his face familiar but he didn't know where he had seen him exactly.

-I guess it didn't go well, right?-the man said looking angry.

Iron Man's mask flipped up discovering Tony Stark's face.

-I got this weapon. It looks pretty cool.

-We weren't here for that, Tony! Fury is going to kill us!

-I'd like to see him try. Relax Cap, you always get too worried.

Now Peter knew why he found the man's face familiar. He was Steve Rogers aka Captain America! Wow, this guy is a national hero and I'm standing right in front of him Peter thought, amazed. Actually, he was seeing Captain America and Iron Man having an argument, a fact which supported his theory about this night being the most strange one of his life.

-And who is this one?-Captain America said, pointing at Peter.

This one? Peter thought, offended.

-You don't watch the news or what?-he said.- I get on them every night. The presenter is a pretty blonde woman, she's very famous.

-I think he doesn't know how the TV works-Tony said.

-There were televisions in my time, Tony-Captain America said, looking even more angry than before.

-Yes, but they didn't have 3D.

Peter tried not to burst out laughing. He succeded but he couldn't avoid to yawn. This made him realise how tired he was. And tomorrow I have to get up at 7 am and endure history class. Who said that being a teenage superhero was easy? he thought. Steve and Tony were still arguing though he didn't know about what, something about a person called Clint. I thought teams have to be united but these guys argue a lot! It's incredible they saved the world together.

-Sorry to interrupt you but I have to go.

-What a shame!-Iron Man said.-I wanted to show you my tower.

Peter rolled his eyes beneath his mask.

-The whole city can see your tower. It's the highest building of New York.

-Almost as big as his ego-Steve intervened.

-Hey!

Peter chuckled and said goodbye. What a pair he thought while he returned to his house in Queens. And I still have to find out what's going on with that laboratory at Oscorp.