“We are Dean and Sam Wesson. I’ve brought my life partner, that’s you, Dean, here to celebrate his birthday.” Sam expects an outburst, yelling, maybe some door slamming and storming around outside, but that isn’t what he gets.

“Oh.” Dean blinks again.

That's the part of the fic that put a smile so wide on my face that it kinda hurt and the rest of the fic kept it there!