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

Erina teases her unpopular little brother as a joke. The virgin brother, who took the joke seriously and mistakenly thought he was tempted to him, immediately inserts his dick into his sister as soon as his parents left. Erina has reached an orgasm due to the overwhelming momentum, but her younger brother, who is not used to women, does not notice and continues to shake her hips in a sloppy state. She climaxes repeatedly as she climaxes as she climaxes even after climaxing, and continues to make her climax until her parents get home.