Sonny hopes she feels that way. He feels an understanding with her too despite the fact they've only just met. He doesn't mean understanding like he has with most people either. As an empath demon, he has a certain innate understanding about people, why they do what they do, what they might be feeling and why-- He picks up on little hints, little signals. With her, it's deeper than that. It's some kind of understanding specifically when it comes to her like maybe she understands him some too. She's beautiful, smart, tough, been through hell, and he's drawn to her.

"Sounds like a fucking good idea. Plenty I wouldn't mind forgetting myself even if my day wasn't half bad."

Just comes with the territory of living as long as the both of them apparently have.