This one isn't exactly Destiel, but I just thought it was so cute.

Castiel had suspicions that showing his wings to the Winchesters would be a bad idea, but he had assumed they weren't five-year-olds. Stupid him.

"Oh my god, Sammy, they're so soft!" Dean exclaimed.

"Dude, I know! I didn't expect wings to be this soft!" Sam answered. Both of them had their hands buried in Cas' soft black feathers.

"Please, I'm not a cat. Don't pet me," Cas said, slightly annoyed.

"You shouldn't have shown us your wings if you didn't want us to touch them," Dean told him. Cas sighed and folded up his wings, turning around to face them.

"New rule: Don't touch the wings," he said, raising his eyebrows for emphasis.

Sam and Dean broke this rule every chance they got, but Cas let them. He'd always been taught to never let anyone touch his wings, but he had broken every other rule for these Winchesters, and he did rather like being petted...