OBA-260 I'm Gangbanged Every Day by My Son's Classmate. Keiko Hattori

Keiko may have spoiled her son Hideaki more than most, but she had no idea that Hideaki was now shunned by his classmates. One day, Hideaki, who had been accepted to a university through recommendation, brought a classmate over to their house, offering to help him with his studies. Keiko thought it was just an ordinary scene, but in fact, the "unsettling feelings" inside them were on the verge of exploding.