The towel is incredibly soft. When they don't have to rely on laundromats and using the least amount of money possible, it turns out that Dean's really good at laundry. Sam is careful not to press against the injuries as he dries Castiel off.

He glances up at the statement, humming softly before nodding. "I suppose that's not a big surprise, really. This whole 'human' thing is still new to you. All the sensations will be, too." Which means, yes, learning how to deal with things like pain and pleasure. Especially when somebody has been working very hard to prove that there's no line in between, even where there should be one. "It's okay, Cas. Whatever happens, I won't be bothered by it. Whatever you need, all right?"