as someone who has been in the role of the cheated, and the other (and I would like to make it clear that I did not know that the person was already in a relationship) I can confirm that it is not a good idea to poke this hive. To say that Nice Time for Roo is a delicate subject, is the same to say that a little water has entered the Titanic, I myself avoid to the maximum works of this kind because it causes me a lot of anguish and almost always has a bitter ending (except for a few works, but those rare exceptions are those where the cheated is a piece of shit that doesn’t care / treats the spouse badly, or is simply a totally pathetic being with no spine that you end up feeling more angry than sorry for him). In TiTS, I only crossed the line of respectful friendship with Beatrice Reasner only once, and just to see what the scenes were like, but it still left a bad taste in my mouth! There are good reasons for Fenoxo to avoid putting this type of content in games! Even in the area of pornography and hentai, Nice Time for Roo is still a very closed and specific niche, which still makes most people uncomfortable!
But as I already suggested, if you are going to put this type of content in the game, it is better to leave the option to enable / disable this feature in the game using the menu. (Kitteh6660 did this in CoC: Unofficially Expanded Edition for fetishes: watersports, addictions and worms and it worked well)