is the mmf scene forced or is it avoidable? is any future ntr sharing/ntr/swinging/related tags avoidable in the future?
The MMF scene is avoidable. So far the only unavoidable scenes are at the start and are a M/F with MC's wife, the MC being forced to watch two girls making out (to tease and humiliate him), a roman patrician fingering the pussy of a futa girl, and the same roman patrician receiving a blowjob by a girl.
Once the MC gets unchained, he gains the agency to refuse sex and look away, at the player's choice.
Be warned that, as Kukipett eloquently pointed out, in this chapter there's not much character-building or story outside of sex scenes, so skipping all of them will leave you with very little (and probably a very bad aftertaste after passing through so much forced stuff).
I can't speak of the future, as the dev didn't disclose his plans, but I'll surely pressure him to make absolutely everything avoidable. Again, he's a slave and I expect that, like in the show, there will be times when he won't be able to refuse (hopefully, only M/F).