The much older and very beautiful sister is a worrywart. Even after her younger brother became a high school student, she still treats him like a child! The sister barges into the bathroom to wash his body and sees her brother's foreskin-covered penis. 'You have to clean it properly,' she says as she tries to pull back the foreskin to wash it... but her brother gets an erection facing her! Even so, as she continues washing, his penis suddenly ejaculates onto her face... Thinking the atmosphere would become awkward, her sister becomes aroused instead and tempts him with an adult, super erotic expression he has never seen before! Unable to hold back, her brother also keeps demanding her, leading to forbidden incest!
