VEC-296 Friend's mother Ichika Kamihata: Ueda witnesses her masturbating and imposes a condition

Ueda, staying at a friend's house, falls for the beauty of his friend's mother, Ichihana. He happens to witness her masturbating while calling her cheating partner. Ichihana begs him to keep it secret, but Ueda imposes a condition: she must not have an affair. A few days later, that condition leads to a different kind of relationship.