Wanting to greedily play with the cutest little sister, Satsuki Yura (YSN-648)

Unbeknownst to him, his younger sister's body had grown into that of an "adult woman," and from then on, he harassed her, using her as a tool to release his sexual desires. Although it was a dangerous relationship, involving him shoving his thick penis into her mouth and piercing deep into her throat, and then casually ejaculating deep into her incredibly tight vagina, his sister, Yura, initially disliked it, but was actually a super horny girl who would wet her cunt and twist her waist.