お父さん4k。水分をマッサージする

Daddy, a professor, invites son with girlfriend to his office for an experimental massage session. He claims it's to enhance empathy between loving partners by sharing sensations. While Dame massages son, Daddy starts having sex with Girl. Son enjoys the massage until he catches Girlriend cheating. A scandal erupts, but Dame diffuses it by offering Guy sex, leading to a new twist.