So here I was, not expecting much, since I didn't know any of the characters actually in the fic. Yet it hooked me from the first word and didn't even let go at the end. It makes me want to track down the writer to their lj and see what else they've written.
Either way, definite rec:
The Amazing Adventures of Kevin Walker, Superhero Extraordinaire
Fandom: Brothers and Sisters
Written by mardia for silksieve
There will be no tights, no cape, and certainly no godawful combination of primary colors. The rest, Kevin's pretty flexible on.