I'm not sure what exactly you're talking about since there is no cuckolding neither for NPCs nor for MC. If you're referring to the fact that MC is watching then I have 2 things to say:
First of all, MC is watching a neighborhood girl that he has known for measly several days teasing him and another guy, married guy(!). And that married guy is getting action, so I'm not sure how that NPC is being cuckolded. And that girl, if you've read texts, actually has a boyfriend so I'm not really sure how MC is being cuckolded either.
Secondly, if you just dislike the fact that MC is watching instead of getting action himself, well, let me ask you this: if you suddenly started randomly hearing thoughts and influencing people what would you do? Would you explore this, try to figure out what is going on, how to control it and what to do next? Or would you just go out trying to influence everyone you see into having sex with you? Personally, I would like to know the extent of my abilities, would like to know if it's dangerous to me and to other people.
MC is 25 years old, not 15. And personally to me the idea of jumping from "sudden powers" to "everyone is my sex slave now" in one frame is boring af.