RCT-984 - Incest Change! A crazy 4P experience with Mom and Sister's swapped bodies

I get the chaos of a mother and sisters swapping bodies and minds... but why? Why do they have to attack the son and turn it into incest? The idea that they're all naturally horny and want to experiment with their new bodies out of curiosity is a good concept, but... the fact that the target is the son... it's laughable. Well, the sex scenes are all super erotic, so it's not bad, but still...