This is a Spider-Man/Avengers crossover challenge and it's a weird one trust me.
Basically it began after the Chitauri invasion where Spidey helped out and before anyone could take Loki away he did a last resort spell but it backfired turning him and the Avengers into kids with only the memories memories that they had to that age but with all their skills.
Spider-Man was the only one unaffected by the spell so he has to watch over all the Kidvengers in the Avenger's Tower while hoping for the spell to wear off but over time he starts to hope it doesn't.
Whether it wears off or not is your choice but there will be some key Spider-Man events in this story like the Sinister Six forming and the battle with Morlun.
He's twenty in this story and his Aunt May died of heart failure two years ago, Gwen is dead due to the Goblin arc from the comics (because I feel like that was an important lesson for him to learn that he couldn't save everyone and it truly defined him) and he doesn't know MJ.
I really hope that someone takes this story.