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!
