She gives her sister an aphrodisiac and a sleeping pill to her boyfriend! She can't forget the pleasure of being raped raw by her younger brother in front of her sleeping lover, and the sister accepts her creampies repeatedly, not letting her boyfriend do it.

My younger brother loves her sister so much that he even wants to have sex. When the boyfriend of the sister, who is the target of jealousy, visits her house, she tricks them into giving her a sleeping pill and an aphrodisiac to her. The older sister is reluctant to her younger brother approaching her sleeping boyfriend, but she feels it due to the effects of an aphrodisiac. What's more, the first episode doesn't end there, but the older sister becomes addicted to immoral acts with her younger brother, who seeks her body so that her boyfriend won't find out, and eventually she even asks for creampies herself...