Hajimete Doushi 2: Happy Bakappuru

While living in a normal school life, Tsukiyo, Haruhiko's classmate, happens to join his house as a house mate. They are nervous at first, but gradually get along. One day, after a date, they find the mood to be nice... Now a lover, Tsukiyo and Haruhiko start to experiment variety of sex. Every night, they get excited by showing each other's perverted actions. Until Tsukiyo leaves the house, they decided to enjoy their erotic life at the best. (Source: dlsite)