u/Final-Duty8412

Looking for a dark cartel romance. FMC is a lawyer from a sibling-run law firm and goes into cartel territory to investigate. MMC protects her from cartel men. Later there’s a scene where cartel members force MMC to try cocaine during a delivery; another guy dies and FMC guards MMC all night with a gun while he’s sick/passed out. Near the end MMC appears to die, but twist reveal: he had a secret twin brother and both were undercover agents. The twin was the one who died. FMC also once asks him to “monster fuck” her.