It's a sunny, cloudless day when Tony and Pepper take you for a walk in the park. The Avengers just recently made through another battle, and some of the others are hanging around in the park, apparently trying to relax after whatever they had been doing.

 "So, what do we do now, Mr. Stark?" Peter had asked Tony.

 "Now," Tony answered, "Is when we take a break."

 You've become quite fond of Peter since you first met him, so you don't mind at all if he hangs around while you're in the park.

 You're walking along together quite happily, until you suddenly stop.

 "What is it, girl/boy?" Tony asks.

 You've spotted someone nearby, someone you hoped you would never have to see again. It's your old owner.

 He doesn't seem to notice you, which is good. You'd rather he not see you coming.

 You break into a run, running towards your old owner, dragging a confused Tony after you. As soon you're up to your old owner, you bite into him as hard as you can, causing him to start shouting and cursing.

 "Here, Peter," Tony hands him your leash, "Get her/him back to the tower, all right? I see what's going on here?"

 Now that you've done that, you let Peter walk you back to the tower.

 "I guess that must have felt kind of good, huh?" Peter asks you. "Mr. Stark told me who that guy is. It sounds like maybe he had that coming. No, it sounds he really did have that coming, not just maybe. But don't worry, Mr. Stark will make sure nothing happens to you. You can't get in too much trouble for biting an old owner who abused you. At least I hope not."

 When you get back to the tower, Peter sits with you until Tony and Pepper get back.

 "What happened, Mr. Stark?" Peter immediately asks. "Y/N isn't in any real trouble, is she/he?"

 "Well, the fact that she/he went and bit the guy out of nowhere isn't one hundred percent appreciated," Tony says, "But no one can blame her/him. There is no way in hell that guy is going to get to have Y/N back now." He pats you on the head. "Nice work, you."

 You feel good hearing Tony say that there's no way your old owner will get to take you back now that the incident in the park happened. Biting someone like that really isn't something you would normally do, but when you saw him, you just felt that sudden urge to do it.

 Later that evening, Tony sits down with you and says, "Guess what? There was a story on the news about you. About how a dog who happens to be an abuse survivor bits its abusive ex-owner in the ass pretty hard today. Apparently, the dog belongs to some billionaire guy now who made sure people knew the truth. I wonder who those people are."

 You know he obviously means you and him, and you feel happy to know that you won't have to leave Tony, and that you'll probably get to stay with him forever if he wants you to, because you would certainly live with him forever if he wanted you to.