Seduced By the Stryxian by Ella Blake

Mazak is a weary cyborg mercenary about to settle his debt to a deadly trade lord and gain his freedom. He is furious when one last job is demanded of him—to deliver a captive human female with an encrypted message inscribed on her arm to a dangerous space station before the message fades from her skin.
This should be straightforward, but after so many battles, Mazak’s cyborg systems are malfunctioning, filling his vision with error messages. To make matters worse, Cora lights a fire in both of Mazak’s synthetic hearts—something he did not think possible since becoming part machine.
Cora Fleming curses every choice she made that landed her at the mercy of an alien trade lord. So much for a harmless adventure after a sheltered life. Now she’s been handed off to a gorgeous cyborg who holds his feelings close and his secrets closer. They are in a race against time to win both their freedom, but deciphering the message on her arm changes everything…as does their deepening bond.