Alright, question...did it ever explain about this corrupted energy he has?
Is it, if he has sex, he dies because I thought it was the other way around unless it was a Succubus Queen
@czarisyn nah he doesn't die there's a doujinshi by the author of what happens after this which is canon i think where he's fine afterward. He just exudes so much pure sexual energy and has dumb high sex drive & stamina.
@czarisyn best I can gather is he's a sexual nuke, toxic fallout included. The doujin seems more alternate outcome than sequel at this point.
That said, no, the libido/energy or whatever it is has not been explained. Weaponized to break a succubus' charm spell and make her cream/wet herself in terror, yes.