His to Command Hers to Use by Alisia Price

When Eddie agreed to explore his darkest fantasy, he didn't expect to lose control so completely. Now, kneeling at the foot of the bed while his wife Vivian surrenders to Marcus—their confident, dominant bull—Eddie discovers that submission isn't just about watching. It's about being used. As leather meets skin and whispered boundaries are tested, the three of them spiral into a night of breathless edge play, wicked restraint, and devastating pleasure...