I actually found this is recommended on here a while ago & forgot to bookmark it but I'm looking to read it again & can't seem to find the post it was on.

In the fic Dean & Sam grew up apart, Mary survived the fire and took Sam to live with her dad but Dean thought they were dead... Dean gets news (a letter I think) saying that his grandfather died and he's inherited the house/estate. He goes to see it and Bobby is the house/grounds keeper who tells him that he has a brother. Sam is traumatised from being kidnapped by the Yellow Eyed Demon years ago and shut himself away in his head not communicating with anyone. As the story goes on we discover that Sam stopped communicating with people to protect them from himself and/or the demon... Dean gradually brings Sam out of his shell as the fic progresses...

If anyone can recommend this or something similar to it that would be awesome! Thanks in advance :)

p.s. I've tagged powers!sam but I'm not sure if he actually has powers in this fic so feel free to remove it mods if it's not correct