How did Harper accidently diablerize their Sire?
Ah. See, her partner Vinny was embraced first, as they unknowingly lived in Willard's domain (Vinny's Sire, Harper's Grand-Sire).
Vinny got roped into a bad situation because of a shitty friend, he ended up storing drugs in his auto garage and being pressured by a gang to keep helping them in this way. Harper hates drugs and never liked this friend because of their drug problem, so their relationship was going through a rocky patch because of this mess.
But in reality Vinny was also dealing with having become kindred and being forced by Willard to resolve this problem and get rid of the drugs and gang as he didn't want them in his domain.
At only two weeks old as kindred, Willard's deadline was fast approaching and so.. not really knowing what he was doing, Vinny panicked and thought maybe if Harper was in this with him, together they could get rid of Willard.
Vinny didn't have enough time to really think things through. He didn't explain to Harper what he was doing when he embraced her, he just asked her to trust him.
Harper naturally didn't understand what was happening, all she knew was that her partner was for some reason killing her and she was dying. When she awoke, she was in fear frenzy, and that's how she accidently ate Vinny as her first meal.
She's somewhat blocked it out in her mind, and her first memory is just being stood over his body, and of course, Willard soon after finding her in that state.
Harper's beast took on Vinny's voice as a way to manipulate and lead her astray. Willard did try to explain the beast to her, but allowed her to continue believing it's Vinny as a means of suicide prevention and just sadistic curiosity. She believes it's really him, causing her hunt to try and find a way to undo what she did.
