Yui and the boys are living normal lives until yui keeps a secret from all of them , there is a twist of black butler part and diabolik lovers season 1&2 Yui Michaels has a secret that she has a kept since her and her father got separated in hell...
Ayato pov I said Rieji what did you do to her . Rieji said Ayato why do you think I did something ? I said she bite me on the neck , what else can I suspect. Kanato said sigh ayato you had that coming to you . I said shut up kanato your opinion doesn't matter . Why did you change her into a vampire kanato ? Kanato said no I did not. * Subaru walks into the room from being woke up from his sleep * Subaru said can you guys be quiet for thirty minutes. I said who turned Yui into a vampire I know I'm a half blood vampire bit I didn't change her ? Laito said my my what did little bitch-chan do now , I said she bite me on the neck. Yui sigh and said guys there is something I got to tell you but I'm craving blood really bad right now.
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Here is Yui in her vampire side,
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Here Yui in here demon side combine the two together and you get demonvampire