[Otonano Gu-wa (Yamada Tarou (Kamei))] Imoimo Yuugi - Sisters Game

An older brother, tasked with watching his younger sister Chiharu, stumbles upon her vulnerable, half‑asleep body and is drawn into a secret, deflowering game that blurs the line between familial duty and desire. The panels reveal his escalating arousal, the tightness of her folds, and his urgent thrust, culminating in a climactic release that underscores the taboo tension of the incestuous sisters game.