Did I hear something about one-night stands? e.e
This is Vitani - she is a human, and a civilian with little to no knowledge of the Supernatural. She is growing friends with the seraph Sariel - which I'm sure would perk mister demon's interest here. She doesn't know Sariel is an angel, so..
Anyway. Vitani travels a lot and gets drunk and spends most of her time in bars and fight clubs and cheap motels. I'm sure those kind of haunts are at least a bit attractive to a Crossroads demon? Maybe he can try to strike a deal with her, and when he tells her it's for her soul she can be like 'lol i'm a ginger i don't have one' or something.
I think it would be a fun little plot bunny~ maybe. But it is up to you. My only other character is an angel, so I doubt they'd do anything but fight. Soo.. any ideas, I'm open!