This is based off of S2 E13 of Buffy the vampire slayer. Where Angel becomes Angelus, you barely knew Angel or Angelus but it’s been one day since this happened and you’re Buffy’s sister you know nothing about Demons or vampires. It’s midnight and well things happen and Angelus and you had sex. At your house in your room the door is locked. Buffy is “hanging with friends” she’s patrolling.