if your future self comes and steals your girl/guy is it still considered NTR? Technically its still you so you can not steal what is yours but you also lost your girl/guy to yourself ?
The General rule is: "If you have to ask, it probably is." Especially if you don't know it is your future self. Say for example, your girl was raped by a mysterious intruder and lost her virginity to that person instead of you. You believing that someone else stole her virginity, traumatized her, and caused you to slightly resent her a bit which strained your relationship with her, went back to the past to be her first before that rapist so that it would get rid of your own resentment and regrets of the incident only to force yourself upon her. Technically yes, but also kind of a no. Until you learn and experience the fact that it was you all along, it is NTR.
Yes it is because if the future you travels to the past, it will create a new timeline which will make him not the the future you. So your girl got stolen by someone else.
If your future self travels in time just to fuck your current girl you are either a massive dick or trying to save yourself
Lol i kinda had a similar question in my head that i wanted to post (from reading a ero doujin): If your lover have sex with another you from a different universe, is it cheating or not ?
This one I think is totally cheating, I mean is still someone else, not you. Olivia Dunham form Fringe would agree with me in this one!!!!!!!!
It is considered NTR if the future you have already broken up or is a an old coot looking for fresh meat/reminisce the old times.
It would be NTR if you have no control over the future you or can't experience what the future you experience as he fucked your gf. You are then basically two different people. Let's ask a more interesting question. Consider that there is a universe where everything is opposite of this universe. Yes, since that universe is opposite yours, the you in that universe is female, if the you in this universe is male. So if the you from a parallel universe where everything is opposite to your universe crosses universe to tell you not to be such a wimp because it makes her too dominant, will you: a) be an even bigger wimp and thus making her more dominant b) strive to be a more average person so that she will be more average c) dominate the female you from the other universe and make her your collared bitch