"You're the one who asked if I was planning on sucking your blood," Mika retorts sharply. "I don't really care if you don't believe me, but you brought it up to start with."

He expects humans to assume the worst, really, he's just annoyed at how she's acting as though he'd somehow started the whole thing. Perhaps fortunately, though, "annoyed" for him almost never translated into "violent", so for all his irritation the thought of lashing out physically hasn't even crossed his mind.