Marry your villainess

if you can't beat her, marry her! You lost to her in fight countless times. Eventually you decided to change tactic - if you can't beat her, make her yours! One day you randomly proposed to her and she was in shock. You kind of expected her to strike you down, but instead of that, she actually accepted it and soon you two got married! You lost title of hero and people call you a traitor, but on the other hand you got a gorgeous and powerful wife. You still fight her, now though it's different kind of fights.