Ruby's expression was one of pure distaste. He had actually tried feeding from those animals claiming to be demons? Their blood had actually sullied him? She had a sudden ridiculous urge to find the breed in question and find a way to wipe them out entirely. They truly were disgusting.
"Those aren't worth it, they're not demons, not really. Though you know...it might not be just my blood, just mine happens to be all you can get here, which admittidly is a good thing"
He put the flask away and Ruby was proud of him, so very proud of him, he'd have the blood whenever he needed it, and she'd hapilly provide refills. Though it was possible she was right in her lie and once he broke the seal he wouldn't need it anymore. She'd miss it if that were the case, she liked this, with him. It was a connection she never believed they could have here. And all part of the endgame. Things were only going to get better from here on in.
"I'm fine Sam" she told him in response to the concern "Really I am, I just need to sit for a few minutes."
And then she would burn the hex bag she wore.
"If Castiel asks I haven't seen you yet, I'm going to burn the hex bag after you're gone and he'll find me,but its better he thinks I went straight to him, he wouldn't understand about all this, Is that okay?"