Everything, girls won't lust after each other, no lesbo tendencies, no lesbo predators, no sharing with other girls. Monogamous relationships, understand now?
I dont have any sharing planned at any point in the story, but I've noticed from your previous comments on other pages that you won't like nor enjoy this VN.
Feel free to try the story anyway, but it's probably best if you just drop it now. Saying this since in your other comments you appreciated people for stopping you from wasting your time!
Either way: no NTR will happen.