Instantly Marceline's defenses were raised. She downed the now clear drink, sat the glass down, and glared. Not at Bex, but in general. "Naah, I don't kill pets. Before you ask, the dog was already a zombie before I found it."
Bit by bit, her defenses lowered, but she was still a bit put off. "Oh, I can drink blood, but ya know, you have to do what you can to survive," she shrugged nonchalantly.
Marceline figured that the sudden shift in conversation shouldn't have surprised her. In a way, Bex reminded her a little bit of Bonnibel; minus the whole Bonnie wanting to study Marceline for science; and Marceline turning her into a humanoid looking raisin. Thinking of her ex made her smile, and she looked at the other vampire. "Listen, I've read stories, seen movies about vampires. I don't about you, but it's all bullshit," she lowered her voice to near silence, and added, "When I drink someone's blood? They pretty much become a mummified corpse."