Hi, I'm looking for forgotten hentai anime. I'm remember it's about sex between mother and son in a wooden Japanese house. at the end of the episode the mother turn into a ghost.

Bump

Now I'm just guessing here. The only hentai I can remember with both a ghost and incest is Inma Seiden, but I can't recall who the ghost is...

Actually, that is the ONLY hentai with both ghosts and incest according to AniDB.net 😀

~4400 manga completed
~1700 ongoing...

No, it isn't. There is no supernatural or demon involved. It's just at the end I remember seeing photo of the mother and incense in the house (I assume she die) (time skip maybe).

Oh well... Here's all the Mother-Son incest hentai that AniDB seems to have listed. There's just 15 of them.

~4400 manga completed
~1700 ongoing...

I've finally found it. it's Inmu 2 episode 2 second story. it's in a collection of short stories. that's why it's hard to find.