Chika-chan to!

Chika, Nao, and Ryo are all friends...with extra, extra benefits. During a threesome, Nao, a loving and mischevious boyfriend with plenty of affection to go around, proposes Chika try out being a bottom. At first, Chika refuses, but after some convincing from Nao, he eventually gives his ass up to Ryo. Once Chika and Ryo start doing it, a whole new door opens to their relationship.
(Source: Futekiya)