[Hyoui Lover] A story about a classmate who hates her and her sister

A brother throws open his sister's door and catches her fingers-deep in a shameless masturbation session — except the moaning girl on the bed is a possessive spirit wearing her body like a toy. When her busty classmate storms upstairs to complain about the noise, the spirit gleefully hops into the far more generous body, kneading her new huge breasts and comparing every inch, nipple to nipple, against what she abandoned. Trapped watching his sister's face and her classmate's body melt through one squirting climax after another, the horrified brother gets rock hard, and the spirit makes sure he knows exactly what kind of pervert that makes him.