Issho ni Ecchi

Momoka, the school nurse, summons the protagonist and compels him into a series of sexual encounters. In a separate incident, he inadvertently observes her younger sister, Maron, engaged in self-pleasure. Upon being discovered, Maron retaliates by removing his clothes and performing manual and pedal stimulation. This escalation culminates in him deflowering her. The narrative concludes with all three individuals visiting a public bathhouse, where they engage in a sexual act involving the trio.