[ Manga Sex ] Issho ni Ecchi

After responding to Momoka's summons, the protagonist is compelled to participate in a variety of sexual actions with the school nurse. A few scenes later, Momoka's younger sister, Maron, is accidentally seen masturbating by the protagonist. When he is caught, Maron counterattacks by stripping him naked and giving him hand and foot jobs to humiliate him. As a result of a series of unfortunate events, he ends up stealing her virginity. In the end, the three of them travel to a public bathhouse and wind up performing in a three-person play.