Seika Jogakuin Kounin Sao Oji-san

Seika Girl's Private Academy has a dark secret. All of the girls at this school are from prestigious families and thus have never dated... even once. So the school had to come up with a way to make sure they didn't get too overwhelmed by their urges...

Futabu!

Niimura Akane is a well-liked girl who has been taken to join the Futa Club as someone who is responsible for "service duty". However, she must pass the entrance test first. Some members are a little bigger than she initially anticipated, but there are some people who are anxious that she is more of a challenge. So began daily events with four futanari in the club. (Source: Translated and Edited from Nekopoi)

Bible Black

Based on the erotic game by Active. Minase, a high school student, found a book of magic in an isolated room in his school. He started practicing black magic that has extreme sexual effects that benefited him and some of his friends. Intrigued, Minase got deeper and deeper into using the craft, not realizing the evils that will come forth. Eventually, the origins of the book was revealed, and so did the incident twelve years ago on the night of the Walpurgis, the night when the power of evil is at its strongest. After coming to his senses, Minase struggles to get himself out of the darkness that he had put himself into. (Source: Anime News Network)