His siren.

“Ares smiled at the memory as steam curled up around him. She had always been his siren, the one he couldn’t resist, the one that he would fight through Tartarus to have. He was addicted to her, and she was to him. They were Mars and Venus, man and woman. They were destined to be together, and he would show her. She would not deny him anymore. Not as long as he had breath.”
-Staci Hart, Snake in the Grass