Power's Fall. Trinity Masters: The Spaniard, #1

Married, but forbidden to touch. Dahlia McKean is living life to the fullest, while she still can. When she's asked to use her expertise and connections to take on a dangerous mission and investigate a decades-old crime, she agrees. And this new adventure comes with not one, but two, very sexy perks: her partners are the hottest men she's ever seen. There's no harm in having some fun while they work.until everything changes and she ends up married.
To both of them. Vadisk Kushnir didn't plan on getting married, but he long ago gave up the right to make that choice. Still, he didn't expect to be sent to investigate a blackmailer in the company of his brand new spouses. His attraction to Dahlia and Montana is instant, but until they complete their mission, they have to stick to their cover story. Which means Vadisk can't touch his husband and wife.but he can watch. Montana King wants justice for his family, and if he has to get married to do it, he will.
Getting to touch and pleasure his hot wife while their husband looks on is unlocking some fun new desires. Thrown into danger, he'll do his best to protect both his new spouses, but their mission is more than just dangerous, it's deadly.