She catches him jerking off and gets this horny

Enough time has passed to know that he has done well in school. The grades that are given to qualify you as a person and then include you on the list of social slaves. So there is something to celebrate, since his mother will be very proud of him for having achieved it. And his reward for having had good grades is to fuck the mother. A mature woman who is happy to suck her little boy’s cock because she knows that at some point he will have money to support her and fuck her as if he were her husband. But with true love that she truly feels.