On the contrary, I think most if not all every person in the world has being cucked at least once in their lives. The problems with these anti ntr people is they always put themselves in the MC's shoes, they want to be the good guys, they imagined themselves as a hero who can get anything they want. well, that's not how the world works. In real life shit happens, in real life ntr happens
I smell some personal experience there
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... Don't mean to disrespect bruh but I kinda disagree with that ... the anti-NTR bois in this thread just want some good Alpha/harem development and action that was promised to them, we don't IMPOSE anything on the dev nor does any1 want him to stop making the main girls NTR bitches. It's his project, he calling the shots. You say NTR/cucking is normal in RL ... true dat, but if u and your girl really love each other and your sex life isn't shitty, I don't see any reason to cheat other than u a wannabe playboy/male whore or she a curious slut or u into swinging.
Back on topic, you just can't make MC's mom a slut out of nowhere and blame him for that ... u contradict your own plot, because she was supposed to start as a prudish mom (u shape her character) and for FUCK's SAKE she's his MOM not his bitch he can't do shit about that, the same goes for the sis. This scenario is commonly seen in those japanese retarded manga, where the mom starts by being a saint for her son and makes a quick turn to absolute disgusting degenerate slut who leaves him/her family and even blames him for it ... yeah, that kinda "logic", best NTR mom ever stereotype, yuck! Now, if the game had the MULTIPLE PROTAGONISTS tag, it'd be understandable to give our "friend" Marcus some development too on the NTR route, but as it is now it seems the real MC is Marcus, our "Elvis" 2.0 is just for cucking purpose.
Plus, he didn't do shit to get his ass NTR'ed, u feel me ... I'm not a pussy scared by the big bad ugly NTR muthafuckas, in fact some competition brings realism to the game, but it's no competition if your rivals get to pound your bitches in every position known to man and alien alike while u just watch and clap(or fap in our case) and wait for your turn. Nor does that make the MC an ACTUAL MC, just your average porn games shady nerd who can only dream to bang a bitch like Sophie or even his mom, aunt, sis, Emma etc. I won't play the game anymore 'till I see some effort put on the Alpha route like in the NTR route, most likely NEVER, but it's worth to check the CG's from time to time and see whats new.