I guess the comic might not go as you expect.
D&D-vampirism isn't defined. It's up to any DM. I very much doubt Rich goes all the way to make Durkon to become friends with a vampire, then get turned (if he does ;)) by that "friend" and then simply lets this stay at
Durkon: "HOHOHO I am an Evil Vampire now! I'll suck you dry! MUHAHAHAH!"