Easy as that my friend, don't play it and let others enjoy the VN.It is an NTR protected by apology! So the previous game was of no use if it would have such an ending in this sequel! Even in that game the mc's mom was already showing signs of being a weak bitch who would fuck anyone who pressured her! Now it's fool to look for excuses to add share shit by handing the old main girls over to a new mc and snubbing the old one, it's been two, what's next?
And the excuse that was provided for whoever came to complain in the future was to make the previous mc abandon the girls, because then it wouldn't be NTR, clearly when playing the previous game, you could see that the mc would not abandon his mother and sister! It practically transformed the previous game, which was a good game, as it was possible to prevent NTR from happening, into a game with no value, I even thought about replaying it, but after that end, it went to the ignored games!
If your brain thinks it's "NTR protected from an apology" that's your problem.