Journey into Mystery #12

A woman plans to get rid of her writer husband by taking him to a house supposedly haunted by vampires and shocking his bad heart. She dresses as a vampire, but he recognizes her and thinks it is part of her attempt to add atmosphere for his horror writing, and he isn't scared. A real vampire bites him later in the evening, and when his wife tries again the following night, the man, now a vampire, bites her.