Ane Ane Z Saimin: Sumaho Saimin Souchi de Bakunyuu Ane-domo ni Saimin Choukyou, Kichiku Netori de Haramasete Yaru!

Based on the erotic game by POISON.

Akihiko's two older sisters are beautiful women with big breasts and great figures, but they treat their younger brother badly. Ritsuko, the eldest sister, is serious and strict, and finds Akihiko's slightest mistake and scolds him, while Makoto, the second sister, is clever and dodges Ritsuko's anger and pushes troublesome tasks onto Akihiko. Fed up with this, Akihiko finally decides to take revenge. He receives a hypnosis device from his senior, and if you call the smartphone containing the device and give orders, the other person will obediently follow. Akihiko takes advantage of an opportunity to successfully plant the device in Ritsuko and make Makoto believe that it is their duty as sisters to satisfy their brother's sexual desires. Since then, Akihiko continues to train them. He awakens Ritsuko's hidden masochistic desires through humiliation play and anal training, and makes her more dependent on Akihiko. Makoto has a boyfriend, so he deliberately orders her around on dates and makes her think that her brother is more important than her boyfriend, and then he seduces her. And so Akihiko's revenge on his sisters is complete.

(Source: Parabook, translated)