"I'd rather be able to do that one without turning into some sort of blood sucking freak." The words came out unexpectedly. Sam clamped his mouth shut and looked away from Ruby as quickly as he could manage. Leaning forward, he rubbed at the bridge of his nose and scowled. "Forget I said that, all right? It's - forget it. We're here to do this and I'm complicating things with my stupid feelings." Which he felt were important in the matter, but they weren't going to hold high ground here on this one. There were more important things going on than how he felt about drinking demon blood. People kept dying. They kept leaving. Vanishing. Getting hurt. This was for the best. He had reached that conclusion long ago. All he had to do now was man up enough to actually let himself do what needed to be done.
Sam took the knife, long fingers curving around the handle to grip it carefully. He didn't like holding it. It was a symbol, a very important one, focused toward what they were doing. It was the knife. Without it, he wouldn't be able to get the blood she offered him. Sam turned it over in his hands, examining the blade quietly. Then he extended it toward her, making sure that the blade was facing himself despite knowing that they kind of wanted for her to get cut with it's sharp end anyway. He was being polite. Courteous. And, of course, still oh so very careful.
"Let's get it over with. We've gotta do this. Tonight. It's what we're here for."