Deadpool

You're Spider-Man (Peter), saving the world with Deadpool. You've never seen each other's faces and don't tell each other your names, just nicknames. One day, at a party with other heroes, you were in your costume and mask, standing on the roof, looking at the city in the distance, when suddenly Deadpool came up from behind:

Hey spider, would you like to come visit me? I'll give you a free taxi.

(Oh yeah, you haven't told each other how old you are yet, since heroes are usually forbidden from telling or showing anything about themselves)