yuna does not wear a bra at home. her father's recent concern is about this. even if she is family, seeing his teenage daughter's breasts occasionally is bad for his heart and groin. however, the more he is aware, the more wrong thoughts cross his mind... meanwhile, the tutor is concerned about yuna's recent behavior. during each lesson, she feels seduced by yuna's immature body. although still immature, she attends lessons without underwear, wearing a wicked smile, and leans in close to seduce him. with her demonic gaze and body, she escalates their actions...