Jolt Somber by Christine Myers

Jolt Somber was the name the cyborg picked for himself. He was created to be a killer and his creators reinforced his killer instinct by flooding him with feel-good endorphins. For eighty years he fought the Mesaarkans at Vyken Dark’s side. He and four genetic cyborg brothers returned to Earth to help restore civilization after the war had ended.
Jolt is supervising demolition in the ruins of Farringay to build a new starport. The war left Earth in ruins with cities ruled by overlords with gangs of thugs as enforcers. Violence against women is rampant.
When Jolt finds his one genetic female mate used and left for dead by gangers, the pleasure he takes in avenging her could have unexpected repercussions.

After what males had done to her, would she ever accept Jolt as her mate?