the game already has dozen of endings/parhs.
just imagine adding to that mix another dozen or more "ntr" combinations...wouldnt that be too much?
and the dev has another game to finish, and another one.
from my side im glad it has turned to be this way - in order to simplify things and produce more quality content in timely manner by devs choice.
those dissapointed due to the lack of ntr, here, and particularly in snowstorm, well, sorry lads, better luck to you with other games/devs

(hapenned more than few times that neutral games with ntr elements became solo ntr games, probably for similar reasons)