Yui's Sadistic Sister (A Diabolik Lovers X Reader Story)

What if Yui had a sister who is the total opposite of her and who was once a member of a street gang who stole and killed people for money? Meet (F/n) (L/n), who was left all alone after the death of her parents and her younger brother who died in a house fire when she was 9. (Y/n) was taken in by a gang who treated her as if she was one of their own. (Y/n) stayed with them for a year, she was trained to kill and steal if necessary but then, one night, the gang leader could no longer look after (Y/n) and he left her at a Chruch where Seiji Komori, a priest and a vampire hunter, adopted her.

(Y/n) thought her life was going to get better, however, her nightmarish hell was only the beginning. After being adopted into the Komori family, the priests and the nuns at the church learnt about (Y/n) being part of a street gang and they tried to make her pure and Seiji hardly paid any attention to her instead he ignored his adopted ex-street gang member daughter and he focused his attention on his other daughter Yui. (Y/n) had enough of the abuse and neglect so, she ran away from the church and she never contacted Yui or Seiji ever since.

What will happen when (Y/n) meets the vampire brothers along with the Mukami brothers and the Tsukinami brothers? Will she finally found the happiness that she had longed for? Find out in this X reader story!