if u like that, its perfect. but I don't play a NTS game just to get NTR instead.
I'm not going to argue about what count as NTS and what doesn't, but I can tell you that I as well as many other people don't see any sign of it going astray to the netorare side.
The bottom line is, the mc fully aware and is enjoying the whole situation, and it stay NTS as long as the said relationship stay strong. He's also not "outside the world completely". How can he be outside of it but still fully aware what happens in it and still connect with the people in it?
Whether the mc is called cucky is also irrelevant, I mean he's indeed a cucky. What's wrong with that? She even so sweetly tells you(or I should say the mc, because this is clearly a role not everyone is able to immerse into) it's an affectionate nickname as if it's not obvious enough, and you can tell her to stop anyway.
While I agree relationship is most of the times, complicated, but i might say the complexity of relationships is exactly the reason why I won't assume a certain way of sharing, or more precisely for this case, cuckolding, will not work, even when it's outside of my personal experience. In fact, the goal of some cuckolding relationships is exactly getting a bull as lover for the wife. Apparently not all woman is the same, a lot of them needs certain level of connection to enjoy the sex with a man, which means for a cuckolding relationship to work, it's sometimes necessary for the vixen/hotwife/cuckoldress to bond with the bull. I personally wouldn't want my girl to fuck someone she doesn't want to.