Yandere Undertaker x Reader 'She is mine, and only mine'

Angelina Blac's back story

This back story is crucial in understanding the entire story so I recommend reading this, and yes that is you in the picture. Just replace the white hair with Yuno Gasai's hair and every single power thinkable.
BTW your name is Angelina Blac. Hope you don't mind~😘
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Angelina had a very abusive parents, they crushed her dreams and hopes, and constantly reminded her how she was a mistake. How she were never to be born. They starved and denied her normal human needs, and one day she killed them and made it look like an accident. She was still confused why her parents would hurt her, and what made it worse was that she never had any friends. High school was crushing her and she was fully broken. Until one faithful day she met a boy, his name was James.(sounds like a fuck boy to me XD) She loved him with all her heart. Some people would call her crazy, obsessed and even a stalker, but to her, she was in love~.But one day she found out what she was and why she felt like that, and she found out that she ......................was a yandere.

~~~~~2 weeks later~~~~~~

Angelina turn the corner as to see her lover(James) KISSING ANOTHER GIRL. Oh she was furious~
She don't remember anything else after that though. Accept the fact that she woke up the next day to see James' decapitated head in her arms and the girl burnt to death.
Then she heard the police banging at her door and she faintly remembers running, running for her life until she saw coffin and dragged out the dead body and threw it into a nearby lake in a haste. Angelina was weak,scared and exhausted. Until she woke up in a shop..............Undertaker's shop.