She holds her breath a little when he takes her hand, choosing to watch him rather than what he's doing. She exhales when he slides the knife across her skin. Pain is something that Buffy learned how to deal with a long time ago so she doesn't even wince.

She does as he asks, letting the blood drop into the vile, still watching him. This Angel is still a mystery to her. He's something straight out of her daydreams and despite the fact that he's been here and human for a while, it's still hard not to stare at him.