Bonyuu-chan wa Dashitai - Episode 4

Kai Hikaru, the introverted big brother, dives into a new chapter of lactating sex when his younger sister, Suzuka, joins the routine. While Hikaru continues his daily milking of the older female student, Tomomi-senpai, he takes charge of Suzuka's body as well. The episode opens with morning sex between the siblings, where Hikaru forces Suzuka to request his cock before draining her inverted nipples. Later, Hikaru and Tomomi swim at school, sharing milk-laden swimsuits and confessing their lecherous feelings for one another. The story moves to a night bus trip to Suzuka's hometown in Kyoto, where the cramped space heightens Suzuka's arousal. After returning home, Hikaru and Suzuka engage in piston-fucking that triggers intense lactating orgasms. The episode concludes with Hikaru on a phone call with Tomomi while simultaneously screwing Suzuka, who mocks his "cheating cock" as he pumps her womb with semen. From the pool to the bedroom, this installment focuses on the power dynamics between brother and sister, the tactile pleasure of milk extraction, and the thrill of forbidden, multi-person sexual routines.