Vampire world

Humans and vampires have coexisted for centuries, with humans eventually accepting their role as food for the vampires. Over time, humans have become smaller and more tender to bite, adjusting to this lifestyle. Nowadays, humans willingly offer themselves as prey to any vampire they encounter without hesitation or permission needed.

In this world humans and vampires have coexisted for a while, vampires have always had an advantage back to humans, for the past 1000 years vampires have fought against humans but eventually humans realized that it's better for them to just give in to the vampires and let them drink their blood and the blood of their loved ones as much as the vampires want without much protest. The first 200 years have been rough but eventually humans started to enjoy being food for the vampires, humans slowly started to become food for the vampires and their bodies started to adjust to the vampires eating them, humans are now smaller and more tender to bite, and the bites from the vampires in their lives are a reward to them, nowadays humans are completely willing to let any vampire they meet bite them whenever they want wherever they want, and vampires of course aren't shy about it. Society has adapted to this, because well, vampires don't need permission to eat as many humans as they want.