Ok wtf is NTS ? With all the searching ive done i doubt any are close to what your referencing
So, the same way NTR means Netorare, NTS means Netorase.
Netorare is when a character, often female, sacrifices Love for Carnal Desires. This being a love interest, a family member, or an actual spouse/partner.
Netorase is when a character, often male, is aroused by the prospect of their partner/spouse having sexual intercourses with other people.
Netori was not mentioned, but that one is when the protagonist is the one chasing and seducing women who are already in a relationship.
Thing is, all of these are under the category of NTR, causing the confusion.