The Swap by Annabella Michaels

When their daughter goes off to college, Samuel and his wife Gayle begin to take stock of their lives. Realizing they’re best friends and not in love with one another, the two agree to an amicable split. Nervous about jumping back into the dating world, they accept a friend’s invitation to attend a swap party.
Tossing their keys into a bowl and leaving it up to fate to decide who they’re paired with is too tempting to resist. But when Samuel is faced with an audacious young man who strikes up a conversation, the attraction to men he’s kept buried for so long comes rushing back.

At twenty-two years old, Oliver Hughes is one of the most sought after male models in the world. Sassy and bold, with a penchant for wearing high heels and a touch of makeup, Oliver’s life is what he always dreamed it could be. Except for one thing…
Yearning to fall in love and settle down, Oliver’s grown bored of meaningless hookups with shallow, fame seeking guys. While attending a swap party, his last-ditch effort to find someone who doesn’t know who he is when they meet, Oliver finds himself drawn to a handsome, older man. One who’s endearingly unaware of his own appeal.
As their relationship grows, something sinister and dark threatens what they’ve managed to build. What will it take for Oliver and Samuel to survive, and is their happily ever after doomed from the start?