Game states there have been cases where vampires have had children with humans, so it may be possible with human love intersts though I doubt it will ever occur in this game.
Oh man, sorry for not figuring out this earlier but I didn't realize these notifications had to be clicked in a certain way to get to the post in question. Whenever I clicked on the notification that there's a new post it just brought me back to the front page. :D
Anyway, I make it a practice not to reveal which kinks I plan on before they are in the game as I feel they are a bit spoiler-y, but I can confirm the vampires in this game are not undead.