MIAB-403 It’s just a promise to rub, okay? A kind-hearted, beautiful younger sister reluctantly helps her shy older brother practice intimate closeness. The overexcited sister from puberty gives in to the teasing and ends up overwhelmed by his large member. Senkawa Towa

One day, Towa witnesses her older brother attempting to take his own life. Desperate to stop him, she is begged by her brother, who says he does not want to die like this, to let him practice intimacy. Towa reluctantly agrees on the condition that kissing is off-limits. But as her introverted, well-endowed brother’s requests grow more intense, Towa is drawn into a forbidden relationship that escalates far beyond what she expected.