Numb3rs Fanfic Finders

Ok so once upon a time I read this fic about Charlie and Colby in a relationship that they were only in because Charlie was cutting himself or hurting himself and he didn't know when to stop and Colby agreed to hurt him because Colby knew when to stop it from doing permanant damage.

I think Colby was seeing the FBI therapist. And Don and Alan find out some how. And I think that Don sees them in the garage and Colby was curled up on the floor, asking Charlie to forgive him and Don mentioned it to Bradford in his next session and commented on how it was like a marriage proposal.

Tx in advance!