Eve Langlais gave the first book in her cyborg series a reboot and I must say I have NO complaints. MUSCLES!
C791 (Cyborgs: More Than Machines #1) by Eve Langlais
Machines aren't supposed to feel, but this cyborg can't help falling in love.
Assigned as a specimen collector for a captured cyborg, Chloe is intrigued by the machine disguised as a man. Kidnapped during his daring escape, he shows her that despite the chip in his brain, his humanity is not completely lost.
Formerly known as unit X109GI, Joe is on a quest to discover his origin. While he doesn't find the answers he's looking for, he does discover that affection and lust aren't just for humans. But when it comes to a battle between logic and love, which side will the cybernetic organism--once a man--choose?
Evaluating his feelings will have to wait though because the military isn't done with Joe. But their threats against him pale in comparison before the shocking discovery of project C791, the revelation of which stuns the rebel cyborgs--and ignites a fury for vengeance.