Bound by the Enemy: His Willing Slave (Bound by the Enemy #2)
Jessi Bond

Sarceda, however, has more sinister plans for Blake's future, involving the ruthless head of Colombia's biggest cartel, a renowned sadist. But as Blake begins to understand Sarceda's motivations and the terrible tragedy that has sent him on a lifelong quest for revenge, Blake realizes he must see it through - even if it means enduring greater pain and humiliation than he thought he could withstand. And rumors of betrayal by the very agency that is supposed to protect him leave Blake reeling. By the time Sarceda gives him his freedom, Blake is no longer sure where his loyalties lie...
Warning! This 14,000+ word story contains kidnapping, D/s elements, reluctant consent, bondage, knifeplay, whipping, and a slightly twisted happy-for-now ending! Adults only!