Doesnt need to be the best at all, or everything would be the worst/the best, but a few boxes need to be checked for me and some of the folks in this thread i guess:
1- The existing relationship is explained so i know whos getting betrayed.
2- The girl doesnt fall over for a dick after 1-2 scenes.
3- The guy notices how the girl starts changing, can be either male or female pov here.
Of course others may have more boxes to be checked, but those 3 are the ones i need on a game to say "ok im going to play this cause its NTR", otherwise i just play other actual corruption games, idk thats just me.