Seitsuu Shasei Kanri: Ue no Kai no Joshidaisei Onee-san

A young boy experiences his first sexual encounter under the careful guidance of an older female neighbor who lives upstairs. She takes control of his climax, introducing him to a world of intimate pleasure and submission. The story explores their dynamic as she teaches him the art of ejaculation control.

As their relationship deepens, the boy finds himself increasingly dependent on her expertise and authority. The older woman uses her experience to manipulate his desires, leading to a series of erotic encounters that blur the lines between instruction and domination.