The only real reason Jason is doing what he is doing now is because the same woman he is abusing protected him when her first son was about to finish him the first time. It is also the same reason why I have no pity for the mother either. If she truly loved her son and wanted to be with him like she is with Jason she would have let him finish the little shit off years ago.
But on another note I see no hope for her first son either. It is obvious that not only will he be humiliated by Jason but just for the fun of it he was made a cuckold.
Hell even if all odds were flipped, and the first son did manage to beat Jason like the very first time and was able to make his mother his woman the last page literally shows that he is smaller than Jason and in Netorare stories like this we know what happens to the guy with the smaller dick most if not all of the time.
I have to ask how is this even cheating at this point? Didn't the mother leave her husband to be with that prick Jason? Plus last I checked she isn't sleeping with anyone else or even dating anyone else at this point so how is she even cheating now?