I hate to be rudundant but when you've done something brill like...
"Done something? Done something?." Snape glared at the stone. "Do you mean to tell me you took an ancient, very powerful magical object of unknown, potentially dark origins and…and wanked with it?"
"Um. Yeah."
you have to be prepared for the ramifications. This was HOTTT and OMFG the best Snape coming back fic I've ever read. I just love Harry in this one.