His teacher was a busty and rather slutty mature woman

Sometimes pragmatism is the solution. Not always, even if they want to sell ease as a solution, the truth is that it rarely helps. Although in this case it may be the correct solution. And we see that this aunt already has to work a lot and also maintain a home by herself. That, linked to the fact that she has had to raise her little one alone, then we see everything she has to do. That’s why it’s understood that she prefers fucking her son to looking for a husband. Because she already has a cock in her house and there is no reason not to put it inside her pussy. It’s something logical.