Fight or Flight Kuroo x Reader

(Y/N) Kozume is Kenma Kozumes' big sister, while others in her High school are rather social (Y/N) is just like Kenma. A cut off introvert. Kenma has had a bestfriend all his life to get the best out of him, but what did (Y/N) have? No one, nothing. (You got held back a year so you are 1 year older than kenma and kuroo) (Y/N) gave no one her attention, for she was always reading but when Kuroo finally decides to acknowledge her existence what will happen? Will you still be a lonely couch potato, or will you be a little more social, perhaps maybe even...fall in love? Will you recover from past trauma...? (for the sake of the storyline making sense you will go to karasuno while kenma and kuroo go to nekoma!) Oh wait did i say you were shy? yeah no, u is a crackhead

Enjoy~!