My son's clubmate gives him an aphrodisiac... twitching, convulsing, orgasm, FUCK

Saeko remarried a year ago to a man with a child and became Manabu's mother, a university student. One day, "Mom, I decided to join an event club," watching Saeko talk with a smile and hope that Saeko would make her university life fruitful... Then a few days later, Manabu comes home with his clubmates. Everyone is doing some kind of evil in preparation for the summer event. Then they came up with the idea of ​​giving Saeko a "original drink" that everyone had invented...