SDAM-144 Sister and brother bathing for the first time in 10 years. "Would you like to take a bath with your brother?" Yuna-chan, 22 years old, university student, Faculty of Literature

"I used to think nothing of taking a bath with her..." Yuna, a fourth-year university student who has a secret crush on her younger brother, masturbates to his underwear. Her brother and Yuna are encouraged to take a mixed bath together for the first time in 10 years. What will become of their relationship that crosses the line? A serious and proud older sister has arrived at the most forbidden form of love.