I like the theme where the son sees his conservative mother being conquered by his bully or friend. Finally, he realizes that his mother is being fucked by him. Over time, he resignedly accepts the situation because he knows there is nothing he can do. He prays that the worst does not happen - his mother becomes pregnant. Unfortunately, with time, the mother falls in love with the intruder, she is so submissive to him that she does not pay attention during sex or she wants to be impregnated. Finally, the worst happens to the son.
To me, impregnation is fucking awesome. By having the son completely humiliated not even by the bully but more even by his own mother, the person closest to him.