In this fic I glossed over the whole Snape/Lily thing (I really only wanted to write about Regulus and Sirius and keep most other things relatively simple - aka Lily and James were going steady and he'd grown out of being an asshole). I also made it so that Peter joined the Death Eaters from the start and Snape (insert entertaining and crazy backstory reasons here) makes up the fourth member of the Mauradors.

Again, I wrote this /ages/ ago, but it was one of the very first fics I felt comfortable sharing with other people - so here you are. :-)