Lord and Master by H.C. Brown 
ASIN B0075IB0EK
Story Rating: 2 out of 5 paddles
Sting Factor (kink): 4 out of 5
When Reynold returns three years later, his lust for David is undiminished. But Lord David has gotten himself into a very nasty
situation. He ran up some gambling debts, which were bought up by a brute named Hale. To keep his father from finding out about his foolishness, David has had to agree to be Hale’s sex slave for ten years. Hale is the kind of master who delights in inflicting pain and humiliation without regard as to whether or not the submissive gets any pleasure from it.
David is in many ways a broken man. He desperately wants to get out from under Hale’s thumb, but he doesn’t think he can ever again find pleasure in the kind of scenes he once played out with Reynold. David still seems to love Lord Reynold, but he also fears him, and most importantly, he doesn’t trust the man any longer.
Reynold is nonetheless determined to get David away from Hale and try to win back his trust. With Lord John’s help, he hatches plans to eliminate Hale and marry David’s sister. The marriage will not only give him the cover of respectability, it will also give him a reason nobody would question to have David close to him. That was one of the reasons he left in the first place; there was no connection between them that would justify the amount of time David spent with Reynold.