zeromike's review is so good, it saved me from this cucking crap.
Apparently the dev is a 'ex'-NTR dev. These people should just stay on their own lane tbh. Perhaps tricking people into engaging in his fetish is part of it.
First: this dev works with AI animation, and he uses a 18+ prompt, It was most likely a bug, I've worked with AI before and it's a common bug.
Or it could be a simple orgasm, womens also release a liquid that looks very similar to sperm when they orgasm, and the MC doesn't mention anything about the liquid, this suggests it could be a bug, or her orgasms, otherwise, the MC would have mentioned it.
Second: if by NTR you mean Netori, in the first season, there's a black girl, and she has a husband, when the MC enters the club room, there's a picture of her and her husband on her phone, later on the game MC fuck her.
That's why the game has the cheating tag here, If you look at the second season, none of the girls the MC is involved with have boyfriends or husbands, nor does the MC have a girlfriend, this explains the cheating tag.
if you see the dev's comment he said that ntr is not in the game plans, he will not make ntr scenes, this is not a ex-ntr dev bro.