ROYD-006 My usually plain and unappealing sister suddenly acts cunningly cute, flaunting her big ass and panty lines, so by the time I come to my senses, I've already finished inside her. Akari Negao

Although cute but plain and uncool, my sister suddenly became sexy after entering women's college and started researching fashion to attract men. She transformed into a cunning figure wearing a tight knit dress and knee-high socks! The exposed cleavage or panty shots from her short dress made me erect even though I knew she was my sister! Moreover, she would stick out her ass without any guard, making me think she was inviting it... so I ended up having anal sex with her and ejaculating inside. Since that day, my sister has become addicted to orgasms from internal ejaculation and keeps repeating the seduction in a knit dress! She's turned into a slut!