His virgin brother, who took his sister's provocation seriously, is not aware that he is cumming and runs wild.

Rei teases his unpopular younger brother as a joke. Immediately after my parents leave, my virgin brother mistakenly thought he was inviting him, his dick was inserted immediately. Rei has reached orgasm due to the overwhelming momentum, but her younger brother, who is not used to women, does not notice that he is cumming and continues to ignore him and shake his hips in a slut. Even after climaxing, she orgasms repeatedly with the pleasure of the thrusts, and her resistance continues to vanish until her parents return home.