Identify Looking for a hentai animation

[vihnyan]

well i remember that one of the first scenes in this hentai is a midle aged man (the protagonist if im not mistaken) and he is alone with a schoolgirl in a train, then he forces her to do a BJ (i think) and this act catch the attention of a succubus girl or something like that, this entity helps him have his way with other girls.
thats all i know and some of those things im not even sure if is exacly as i described.