I have a half-thought idea from the kid's pov. Basically, Clint and Natasha's covers are being librarians, and the other Avengers are school teachers as far as the kid knows. So, Tony teaches math, Bruce teaches science, Steve teaches history, and Thor is gym. Coulson is the principal. *G* Then kid is getting to be around 12 or 13 and realizes that shenanigans are afoot. Education jokes abound. Te one line I really have in my head is Clint yelling "I learned the DEWEY DECIMAL SYSTEM for you!"