MIKE TYSON is running late for dinner. He opens the back door of his guesthouse, his broad frame filling the doorway. His wife, Kiki, looks up as he shuffles over to her in the small kitchen and gives her a kiss. “Am I eating tonight, or am I finished eating?” Tyson asks. She’s sitting on a stool in yoga pants, toweling off her hair. “I got you Nobu,” she says. “What’d you get me?” he asks. “I got you your fish,” she says. “The fish I like?” They’re in the guesthouse because their actual house, a sprawling mansion in Henderson, a residential suburb of Las Vegas, is under construction. Instead of flopping off to a hotel, where fans would flock, they’ve retreated here. Mars, their fluffy goldendoodle, makes his rounds…