Blood soaked era( Castlevania harem x female vampire hybrid reader)

In Wallachia there lives a castle that no one dares to go too, human nor vampire go there because of who lives in that castle, two hybrids of vampire father and human mother, one sister the best in combat and the other sister the best at magic alone there strong but together there indestructible. They stay hidden from both vampire and human worlds because both of there parents were killed by one or the other so the sisters chose to stay out of it all. Once and awhile they choose to bring in strays from vampires to open minded humans who seek knowledge, they live in both peace and harmony, that was until Dracula waged war against all human kind.