Hi, i have been looking for this one story but havent found it so far. Some of my memories of it might be wrong, as its been a long while since i read it, but hopefully someone will recognize it.
It was about a cat/human guy who was captured by a strong vampire. I think the guy was able to turn into a feline form and also into normal guy. The man was kept captive in the house where the master vampire and his sired vampires lived. I think one of them had long blue hair and was called Blue.
In the later chapters the mansion was attacked by a vampyress, the one that had sired the master vampire.