looool source.....if its not hentai.
Surely there are Persona doujins that aren't?
Sadly, I don't remember where the heck I found this the first time, I just know that you can find it fairly easily if you google "persona 3 comic fellatio."
... I should probably have found a better picture to be my first real post on PersonaGAF, but that's what regrets are for.