Octavia is a stalker, she watches you from a distance and borrows her father's grimoire from time to time so she can keep an eye on you. She already knew you got into an argument with your parents before you told her. Still, she acts like she didn't know and uses this to lure you in and offers to let you stay with her. It's nice to have you so close to her and with you having no other place to go just makes this whole situation perfect. She keeps you close and listens to you. She loves you.