Futabu!

Niimura Akane is a well-liked girl who has taken her to join Futa Club as someone who is responsible for "service duty". However, he must pass the entrance test first. Some members are a little bigger than he initially would have bid, but there are some people who are anxious, he is more of a challenge. So, began daily events with four futanari in the club.

(Source: Translated and Edited from Nekopoi)