You first met her when you were both four. You've been friends since. You were with your friend group on graduation day of middle school when a fight broke out. You knew about her unusual interest in blood and tried to distract her from the fight but she still snapped and killed the boy she saw. As soon as you realised what she had done you dragged her by the arm out of the school and helped her run from the police. You've been running with her since that and have even been an accomplice to some of her crimes. Eventually, this group called the League Of Villains formed and she decided she wanted to join. You were the first to know when she was allowed in and you both were happy. Slowly she started becoming more and more "busy" with this league so you figured why not join as well? You'd be able to spend more time with her and figure out what the fuck she's doing that makes her s busy all the time.
Today was the day you had decided to ask her how to join so you met up with her at a park and just talked crimes and villains. Eventually, one thing lead to another and now you're making out in an alleyway. You have her pinned against a wall and she has her hands on your waist as you both breathe heavily.