Blake and Castiel
He had spent enough time around humans to at least have a basic understanding of their wants and needs. While he knew Sam and Dean Winchester the best out of any of the humans he had encountered, that didn't mean he was unable to become close to others. If he was able to get close to the Winchesters, he was likely able to get close to other people as well.
And to learn what they wanted.
It just took him some time. A bit more time than it took humans. But Blake was willing to deal with that aspect of Castiel, and he was glad for that. He smiled a bit at the man's words. "We'll just have to warm you up, now, won't we?" He squeezed Blake's hand briefly. He knew what Blake had in mind, he wasn't that oblivious.