Dude. OMG. Yes. Sibling love and family compromise, indulgence and annoyance. Gee, bb, it's like you have kids of your own... *snerk*
I love this. The intimacy between Harry and Severus throughout the entire story, the way Harry kept trying to seduce Severus and succeeded in embarrassing James. The little details like Severus noting the height of "Harry's children" and the way they ultimately obeyed him.
Excellent slice-of-life summer story! Though now I am insanely jealous and want to go to Italy.