Desideratum: Blood Bonds is an an adult visual novel written by Anaximanes Entertainment. The game has a horror fantasy plot and is part of an interconnected group of visual novels called The Anaxverse.
Pick one on the two main characters to start your story. Choose either Brone Lorcan - a beast with a beautiful soul, or Absinthe Van Helsing - a beauty with a beastly spirit. Expect a lot of reading, accompanied with sexual depictions of women, vampires, evil monsters and latex suits made of the very blood of Dracula himself!
Note: gameplay doesn't start until chapter 4.
Updated to the final version, including Chapters 1 - 20.