Generate a question about the following movie plot: In West Dallas, Texas, 22-year-old drug dealer Chris Smith, desperate to pay his debt to loan sharks, decides to murder his mother, Adele, to collect the $50,000 of insurance money. He has been told by his mother's boyfriend Rex that the sole beneficiary will be Chris' younger sister Dottie. Assuming Dottie would share any money she gets with them, Chris manages to rope his dim-witted father Ansel into a conspiracy to kill Adele who is Ansel's ex-wife to get the money. Chris also enlists the help of Joe Cooper, a police detective who has a side career as a contract killer. Ansel plans to split the money four ways between themselves, Dottie, and Ansel's new wife Sharla. Dottie hears the plan as they are talking, and agrees that it's a good idea. The plan almost fails when Chris is unable to front Joe's fee. However, Joe is interested in the odd, childlike Dottie and offers to take her as a "retainer" until the insurance comes through. Through Dottie's interaction with Joe, it is revealed that Adele tried to kill Dottie once when she was an infant. Joe "dates" Dottie and then appears to be staying over at their home and having sex with her regularly. Chris has a change of heart and asks him to call off the hit, only to discover that Joe has already killed Adele. With Chris' reluctant help, Joe hides the body in a car and torches it. After Adele's death is discovered, the family learns that the insurance claim actually pays to Rex, rather than Dottie. Chris admits he originally heard the details about the policy from Rex, who also told him about Joe. The family all realize that Chris was duped into hiring someone to kill Adele. Immediately afterwards, Chris tries to talk Dottie into running away with him to escape the loan sharks. Dottie says she will go with him, but she must see Joe again first. After Ansel and Sharla return home from Adele's funeral, they find Joe inside with Dottie. He comes out of her room and asks increasingly pointed questions of Sharla, which ultimately leads her to admit that...
Joe starts a physical relationship with which character?