If you agree with TheOutIaw on the above example(s) that they stated of NTR taking place, then it is not skippable or avoidable. IMO NTR or the threat of said NTR taking place is a MacGuffin and nothing more. In narrative, the Player Character has their mind reset and there is no memory of the after prom incident or the past week.
If you disagree with any of the example(s), or want to see what all of the fuss is about, download the game and do two playthroughs; one Sub Alexa, and one Dom Alexa. If you see what happens and call it NTR, then delete the game and go
here to discuss it.
If you want to go further down the rabbit hole, do a third playthrough and when it asks you to upgrade Alexa do it. Then continue through the playthrough and there should be an option just before going back in time "Not The Real Emily". Select that and you get a scene where you push Emily towards Melvin through manipulations by Melvin.
If you do not select "Not The Real Emily" the scene plays out the same way that it played out on the last two playthroughs. One last IMO, for me NTR is subjective and requires a willingness to be NTR'ed. While there is a line of dialogue that one could use to infer willingness, that could be an easy lie from Melvin as a way to humiliate the Player Character.
Whatever you decide to do I got no beef with you, and I hope that you enjoy your time here on F95.