[Rannero] My sister can't be this bitch

A confident sister teases her brother, daring him to touch her chest while he blushes and stammers. The tension escalates as she revels in his curiosity, promising more intimacy tomorrow, while he wrestles with the moral conflict of cheating on his crush, Takashi. The story builds to an intense, private encounter where she declares how good it feels, inviting him to watch and join, leaving their secret relationship hanging in the balance.