Adolescente le enseña a su compañero de clase lo que su padrastro le enseñó

Martina does homework with Jose Carlos, her classmate. Once they are left alone at Jose Carlos's house, Martina takes the opportunity to teach him a game. Jose Carlos finds the approach to the game a bit strange, but Martina tries to convince him that the game is funny and that if he obeys what she says, in exchange she will do his homework for a week.