Fune, jokingly teasing her unpopular younger brother. The virgin brother, misunderstanding the joke as a genuine invitation, immediately inserts his penis into his sister right after their parents leave. Fune reaches orgasm from the sheer intensity, but her inexperienced brother, oblivious, continues to thrust his hips wildly. Despite reaching orgasm, the relentless pounding drives her to chase after pleasure, repeatedly climaxing until their parents return home. "I... I'm already coming!" she screams, but he completely ignores her, making her climax over and over with his frenzied thrusts!
