Dean has a surprise for Sammy, only it doesn't really work out... If you want it can be Twincest

How does Dionysus claim his kids?

Tonks and Lupin have died in the Battle of Hogwarts, leaving behind a new-born son. Teddy has inherited his mothers changing skills: his hair changing color to the hair color of the person he wants to be held by. This is all very well when he wants his foster-father, Harry but what if he wants a Weasely? After the Battle, before the other kids.

Sam wakes up and has a shower. What he is not expecting, is Dean getting revenge on him for a small mistakes... From a Tumblr post, so may be familiar

Sam has got into collage but his dad doesn't want him to go... But, his older brother Dean is determined his Sammy is getting a better life than him. Teenage!Sam Teenage!Dean Asshole!John. Set before the series.

Sam dresses up as his favorite superhero and surprises Dean. Kid!Sam Teenage!Dean (No slash, sorry kids)

AU where James and Lily are alive. Harry and Ron get into trouble and the school bets on which parent will send a Howler first.

AU, where Dean is a astronomer and finds a undiscovered blue star. What happens when it disappears? Implied Destiel. Its better than the summary.

Blind!Cas and Tattooartist!Dean Just a sweet fluffy oneshot. AU. Destiel

"I MEANT TO SAY 'BUDDY' OK!"

Whilst in a graveyard in New Orleans, Nico meets someone he's not expecting...

Sam is alone. Dean has gone off on a hunt. but when demons threaten Dean can Sammy get there in time?

"Hey, hey Dad, are you afraid of ghosts?" "I ain't afraid of no ghost" slight Destiel, oneshot.