Reap What You Sow
Reap What You Sow is a story written by Seishin No Uwagi and illustrated by enkaiein. It ran in Issue 36 at http://s2b2.livejournal.com/214699.html, and is mirrored at http://www.shousetsubangbang.com/mirror/reap-what-you-sow/.
Superheroes and supervillains can totally get along. No conflict of interest there. At least that's what Dark Ash tells himself when he runs up against BoyMercury and into a hard handful of a situation that he can't quite get a firm grip on. Nothing could possibly go wrong, and yeah, he believes that like he believes in Truth, Justice and the American way. As a traditional villain, Ash is a firm believer in taking what he wants, but the thing about heroes is they have this irritating tendency to come out on top.
From http://flugantamuso.dreamwidth.org/37638.html: "short, superhero/supervillain."
The premise of Reap What You Sow is broadly based off the DC universe (and takes place within it) and is more specifically based off the ridiculous antics of the Young Justice TV series.
The character of Ash is inspired by Lights Out by Breaking Benjamin
The character of Mercury is inspired by Burn It to the Ground by Nickelback (yes, Nickelback).