Help me find this japanese movie

Hi, I can't seem to find this movie again, it's been months since I saw it for the first (and last) time.
It was a japanese uncensored "full movie" about a young virgin school boy, and for the whole movie there are several women having sex with him.

If I have to describe the feeling I felt was that there was a seduction game, it was going rather slow for the undressing parts etc, very sensual.

The movie starts with the boy in his room at his desk, and IIRC every scene is with a different women but in the same room/bed eveytime.

Help me please !!