Cas wasn't about to question the nature of Anna's cravings. So long as she wasn't consuming anything she wouldn't normally, he wasn't concerned - he'd been monitoring her closely since the revelation of her being with child. His observations yielded no troubling results and he felt that Dr. Grey would have informed them of any abnormalities, so from what he could tell, their child was a successful human-angel hybrid without being a nephilim. His concerns over that were almost entirely quelled, much to his own personal relief. "You're very welcome."
He kissed her back, unable to resist nipping her lower lip and smiled softly as he pulled away, placing the bag in her hands. "I'll finish here," he replied, nuzzling his nose against hers. "Enjoy your thin mints."
It wasn't out of a desire to do something he felt she wasn't meant to. In fact, so long as she stayed away from the physical portion of hunts, then he had no qualms with her continuing to hunt. She was still very capable in terms of research and preparation, perhaps more qualified than he was. There were still things he tended to forget in regard to his own mortality. It was not out of a desire to forget, but simply old habits he found he couldn't break himself of. Being human was still a day to day process for him and he knew how dangerous that was.
"Have you heard from your sister?" he asked, taking the dish towel to wipe down the counter. "Or perhaps one of the others searching for the necromancer? I keep checking my messages, yet...there is nothing."
In some ways, he felt it best to continue discussing these things with her because there was no one he felt he'd rather discuss them with. There was of course Sam and Dean, but he discussed it with them in the same manner he would temporary business partners. He was not their third wheel, as they put it. And while a third wheel provided stability, his hunting partner was in the same room. The fact that she could not hunt with him physically at the moment didn't change that. Even if all he wished to do was climb into bed next to her and simply share his time, there were still important matters at hand.