When Yuito was 3 years old (Part 1)

So this is a book about a girl name yuito. She meets a man named Troy but he has a dark side. The dark side is called Tyler. Yuito is like Tyler and Troy's little sister ,but what happens when she starts to feel something more? Will she be pushed away or loved...
(This is after a roloplay that I do. Yuito is me she is half vampire and unknown to troy/Tyler she like them also there her master but that latter in the book!)