Sherlock wasn't expecting anyone for Christmas, and he certainly wasn't expecting this. Jamlock and Greg/Molly
After seeing the musical about their lives, Sam can't stop making Destiel jokes. Dean's tired of it, so he starts talking about Samifer...Let's just say things get a little out of hand.
John and Mary are about to go on their honeymoon...then why do they have 3 tickets? Jamlock!
Sherlock, John, Mary, Molly, Mycroft, and Greg go miniature golfing...this should be fun. Pairings: Mary/John, Sherlolly, and Mystrade if you squint.
Thanks to Sam, Dean gets to spend his night pretending to be gay...with Cas. Can be seen as pre-Destiel, or just Sam messing with his big brother.
Dean pulls a prank on Sam with the help of Cas, but who will end up having the last laugh? (I wrote this imagining what would happen if demon Dean was just Dean with demon powers, and not Demon Dean the evil demon thing.)