Crush has become very over protective, aggressive, and just plain psychotic. One day while O/C was talking to someone else, Crush got jealous and kidnapped O/C. O/C tries desperately to escape but it might take a while. Crush punishes O/C for; Making them feel the way they do, trying to leave, and just for the hell of it

(And this can be reversed roles as well where O/C is the Yandere and Crush is trying to leave)