Stiefmoeder, stiefdochter en het vriendje van 2

On a certain day, her stepdaughter takes her boyfriend home to study for the first time. Her stepmother welcomed her daughter's boyfriend, who is much older than her. The 2 go up to study with a promise to come down soon after their studies. His stepmother notices the delay of the 2, and went to see what they were doing. But she notices that she was doing poorly in her studies, she wasn't very good in bed with her boyfriends, and her stepmother went to explain the right way to be good at everything.