My parents' remarriage suddenly gave me a big-breasted sister-in-law. Her sister-in-law is Misato, who has an innocent personality and is defenseless at home without a bra. She sometimes secretly gets an erection every time her breasts appear and disappear. "Are you a virgin even if your brother is a virgin? Haven't you seen boobs? Shall I let you touch me?" From this day onwards, I look at my parents' gaps and have sex with Misato.
