Not really, for example in the futa scene you can choose for it to happen or not, and if you choose for it not to happen, well, that doesn't happen at all.
Regarding NTR, you can choose if the scene is with an LI or if it is with an unknown prostitute. If you choose to have her be an unknown prostitute, then the scene implies that the one who is there every night is the prostitute and not the LI.
In fact, after watching the NTR scene, I find it much more worrying that the LI is there as a prostitute than the scene itself where the guy who is not the MC is left as the loser and it is the MC who ends up fucking the LI.
Anyway, as Dev said, canon is what the player sees, so if the player decides there is no NTR, then that is canon in his game.
EDIT:
As I say, the only really official NTR is to steal a guy's wife, which is netori.