On a trip with my wife and me my mother-in-law tricked me into fucking her. On a different occasion, it was only proper to take in my sister-in-law, too.
The wife got menopause and sex dried up, while at work, James discovered what the boys in the lab at their (generic) pharmaceutical company were working on. After talking to his friend Derek about the drug, James went home and not being able to resist gave one to his wife and the other to his daughter.
Son's best friend brother seduces son's MILF mom and Aunt. Or were they drugged. Mom and Aunt are both teachers at the same school the boys attend. The two MILF are blackmail into joining the one eye snake club. They find out there are three other MILF Teachers already in the club. At the end the son is the master.
Rick's a horny teenager and his Grandpa is a horny old man. When Grandpa arrives at Rick's house with a mind control formula, Rick's world changes for the better.