its a pretty lengthy fic where Dean and Sam is a d/s relationship but Dean goes overboard with Sam. Like Sam did not want Bobby to know about this type of their relationship. If i remember correctly, Dean broke that trust and somehow Bobby found out about it. Dean was also progressively getting more violent. I think the readers found out that there was something that caused Dean to go this far. Thanks for your time~

Found!- Fic under comments Author:flutternutter