A brother loves his sister so much that he wants to have sex with her. When his sister's boyfriend, who is the object of his jealousy, comes to visit the house, he tricks them both, giving the boyfriend a sleeping pill and the sister an aphrodisiac. Although the brother approaches her in front of her sleeping boyfriend, the sister is reluctant, but the aphrodisiac makes her feel good. However, it doesn't end with that one time, and the sister becomes addicted to the immoral acts with her brother, who wants her body so that her boyfriend doesn't find out, and eventually she even asks for creampies herself...