The only thing I can tell you is, Harem/romace doesn't work very well with NTR/sharing.
And you have no idea the depth of this war. Like think of a cold war, only much more active and violent.
And I as one who doesn't like NTR content/sharing, I consider myself one of the most tolerant, as I can play some games that have NTR and avoidable sharing and even some that have some "NTR" (at least by F95 definition, that LI having sex with another guy is ntr) at the start of the game as an important factor in the game's storyline. What many can't and when they see the NTR TAG or share they jump right away.
And if you think about including that kind of thing, I still suggest that you focus on that then, because it's a shot in the foot to include a little scene, making a lot of people skip your game, and because it's just one thing it won't attract fans that kind of thing.
So DEV, choose your audience and work with it. Good luck and stay safe.