He's shifting around as if he's uncomfortable, and Natasha's eyes don't move from him as she falls completely still this time. She's studying him, because although he doesn't have a pulse, everybody has tells, even after hundreds of years. He doesn't look as if he's preparing himself to tell a story, so his warning that she's not going to believe him is taken with a little more faith than she would probably give.

"Well I can't believe you if you don't tell me," she points out with a raised eyebrow of suspicion. "And if you like feeding in the morning then I'll just keep doing that for you, I don't mind. But you look like you're about to tell me that you need a coffin to sleep in at night or something." She says it with a half-joke in her voice, but it's still obvious that she's unsettled by his behavior. She even moves, reaching out as if to touch his hand before quickly catching herself, and Natasha frowns a little before pulling her hand back to fold them in her lap instead.

"Sorry..." she frowns. "Yes. I believed that you aren't a liar, and you're making me nervous, Jasper. What's going on?"