I would recommend one that I already know of but..I forgot to bookmark it a long time ago. Its title was something along the lines of "Three's A Crowd" or something? Where the Avengers are in highschool and the Wonder Twins fight for badass Tiny Tony's attention before settling on sharing him between them (I definitely remember Sam or Clint playfully suggesting that they share Tony but, Steve and Bucky actually considered and agreed on it).
Hecc it, just--I need super soldier rivalry for the tiny genius. Plez help