I think I found it on a Japanese fanart site; I will try & remember to check when I get home to see if there are identifying details on the saved pic (probably not). Is it not AMAZING, though? I hide under its sheer awesomeness.

Repo! stole my heart, won't give it back even though I made all my payments on time, basically makes me write tawdry incest fic, HOW CAN YOU GO WRONG?