Meet the father-in-law

Harry is dark, always has been, why? Because he's in love with the dark lord'son. Thomas called the Dark Prince, has his own followers, Harry as his right handman. Voldemort came back. He wants to know his son.Only problem? He doesn't know that Harry, without his gryffindor persona, is his son's lover. Now he's going to meet the real Potter, his son-in-law. SLASH. Major OCs.