I consider ntr the same as cuck, but I'm not sure if I'm right because everytime I ask around some people say it's the same and some not but yeah at the end of the day I consider it same as cuck and it will be something that player should have selected already at the start, if you selected it then you'll have the content if not then not
i think the reason people say its not is because NTR is 3 different terms in 1.
netori: The act of the MC stealing someone elses Girl through any means, be it rape or romance.
Netorare: The act of someone stealing the MC's girl through rape or romance.
Netorise: The act of the MC actively allowing his girl(s) to have sex with other men be it willing or not.
this being the reason i said you might want to seperate them on the beginning choice, since netori is still ntr, but in the MC's favor, it could be as simple as leaving the "Cuckolding" choice but adding a "Cucking" choice as well, or adding "Cuckolding: Cuck" and "Cuckolding: Bull", Bull being the term used to describe the one fucking someone else's girl.