I love that Tony's reponse is not that he can't have kids in the tower because he knows nothing about kids but because the tower is dangerous, I love that Thor has kid experience or at least gets them, and I love Darcy's “Want to help me make cocoa and some dinner for our formerly-adult-now-tiny-child-through-mysterious-means coworkers? Because I don’t know what else to do.” and Steve's okay, because yeah, what'cha gonna do? *grins*

“Otherwise, we do it the long way. Only another what, ten years?”
“The Avenger’s Homeschooling Initiative. Fury will shit bricks.” Bwahahaha!

You've painted Natasha and Clint as realistically acting like kids whilst still being themselves, the team are all great, I like the reason and the how, and the thought of being a kid forever but never growing up is alarming, I liked Natasha insisting that Bruce wake up and punch some people because she doesn't like them, hah, and I liked the sentiment of giving our two Master Assassins some happy kid days :)