Thomas Cordero, a 41-year-old from the Bronx who is paid to clean houses in the nude, and finds clients via Rentboy.com, confessed to killing client John Conley way back in October 2001, prosecutors revealed today in a case hat has the killer facing a 25-year prison sentence. Conley, a 50-year-old paralegal, "got too rough" in bed after he "wanted to get down to business" and grabbed a knife — which has Codero claiming the slaying was in self-defense. Condero says in a videotaped confession that he "grabbed the knife from him and hit him in the back of the head." Then he left Conley's apartment but not before grabbing from his wallet, "per our agreement. So why did Cordero, who was tied to the murder in 2007 through surveillance video, send his client into such a frenzy? "It's because I have a nice ass."