MIAA-015 Haruka Akane's virgin brother takes his sister's provocation seriously and doesn't notice that he's cumming, causing him to explode with pistons.

Akane was teasing her unpopular younger brother, but the virgin brother mistakenly thought she was really inviting him, and immediately after her parents left, he inserted his penis into her. - Akane cums with such force that her younger brother doesn't notice and keeps shaking his hips. - The pleasure of the piston continues even after climaxing, causing her to climax repeatedly, and her resistance becomes futile as she continues to cum over and over again until her parents come home. - The second part of the popular series where the older sister screams “I’m cumming!!” and makes her climax with a complete blasting piston!