De-Aged Team

I was wondering if anyone knew of any fics where multiple characters were aged down--the whole team, half of it, whoever happened to be in a building at a certain time, whatever.

Along slightly similar lines, I'm also wondering if there are any kid AUs around, where the characters all meet when they're all younger (high school age or younger).

Mods, I really wasn't sure how to tag this, so I just grabbed the ones that seemed to fit...if I missed any, please let me know!