Tsundere Inran Shoujo Sukumi (2012)

* Based on the erotic doujin game by Pin-Point. When Yui visits his school during summer holiday, he accidentally finds Sukumi, his classmate, masturbating in the female locker room. "If you don't want me to bring it out into the open, come here every day!" Her orders gradually get bolder and they have sex in the pool...? Super erotic summer holiday! His endless summer with Sukumi now starts!