Power Couple (Superman/Wonder Woman #1-7)
Even though he's mostly associated with Lois Lane, one of Superman's closest comic book romances included Wonder Woman. As the title suggests, the 'power couple' wishes to lead a secret romantic life while going on dates like a normal couple.
But villains like General Zod and Doomsday don't give them any time to unwind. And when the media leaks their relationship, they must figure out where they stand in terms of their feelings for each other. With such personal angles involved in the story, Power Couple is a light-hearted detour from the usually serious New 52 storylines of Superman and Wonder Woman.
A Savage End (Superman/Wonder Woman #25-31)
Superman crouches while Wonder Woman flies above him on the cover of A Savage End
By the end of Superman/Wonder Woman, the titular heroes are no longer in love but that doesn't stop their partnership from saving the world. After Vandal Savage steals the Kryptonian hero's powers, Superman falls in a weakened state, and Wonder Woman desperately seeks the help of the Olympian gods to heal him.
Their love for each other is tested as Superman must pass a series of tests to prove that he's worthy of being rejuvenated by the Gods. The final battle with Savage also draws them closer although their romantic relationship still seems to be ominous enough to keep readers guessing till the very end.