Gamble by Livia Grant

The Dungeon Master is kicking off his mid-life crisis in Vegas with a bang.
Turning fifty was bad enough but as a retired Hollywood stuntman, Elijah’s worn body has been put through the wringer. All he wants to do is stay home and try to ignore the ticking clock of life. Instead, his old adrenaline-junkie buddies drag him to Vegas for a birthday blowout.
Then the universe delivers the best kind of birthday present, a weekend of no-strings-attached debauchery with a woman who reminded him of his youth. Except now he is technically old enough to be her father, and it had been years since he’d dated a ‘vanilla.’
It was supposed to be one weekend. Fun and done. But he can’t stop thinking about her. If only the universe would intervene again.