How do i get xavier to leave me alone?
Even if I prefer the other answer, once you get a girl to love/obey you enough, you can go to his room, or get caught, and there will be an option to
execute plan "some greek letter", or something like that.
Rogue, Emma, Laura and Jean can just do it if they are above some threshold... Kitty and Ororo need to be above that AND you to get some dirt on him from his office.
Both girls can open his room at night, and I think Storm references Lockpick Lawyer (?), I would not put it above Oni to do that kind of gag.