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This was written for this prompt:
A battle with Loki leaves Tony de-aged physically and mentally to the time he was in college.
young!Tony takes it all in stride. He is duly impressed by his armor, confused and excited by all the superhumans (Thor and Hulk) around and then is smacked by the realization that the boring blond hovering around is actually his MAJOR childhood hero / crush / source of adolescent fantasies Captain America! Cue teen!Tony trying his best (and maybe succeeding?) to get into an increasingly flustered and blushy Captain America.
Bonus if teen!Tony is still way way more experienced than virgin!Steve and is *delighted* to get to top (and deflower) Captain America.
(Um, extra bonus for including a little bit of Rhodey and Pepper interacting with Tony. Also super bonus for Steve unearthing Tony's daddy issues by the dozen.)