Four-five by geenajay

Four-five - geenajay

An engaging slavefic in which Sam discovers Dean is not his brother but was instead John's slave. It becomes apparent that Dean has been abused from an early age. Sam has to convince Dean that he has no intention of selling him. The ending is rather abrupt, perhaps there will be a sequel.

Source: http://archiveofourown.org/works/7621738?view_full_work=true