I can't believe I didn't save this fic! My memory from it is not the clearest but hopefully you can help me anyway. :)

Dean and Sam are in the same school. Dean had been injured in the previous hunt and fails to hide the injuries  from a concerned teacher. The teacher contacts the school nurse because she wants to get Dean checked out and when Dean refuses they begin to suspect that he is being abused, possibly by John. 

Then I think CPS comes in there and they all try to convince Dean to get him looked at and he finally lets them. I think he has injuries on his shoulder and back? Not sure. They keep saying stuff like "It's ok Dean you can tell us, you dont have to protect your dad."

Then, because they think he is abused they hold him down and  gives him a sedative OR checkes if his been sexually abused too (its one or the other can't remember).

Later John comes there and Sam is also there and then Dean starts vomiting because he gets migraines when hes stressed out?
Down remember what happend next.  Dean tries to protect Sam during all of this.