Children of the Sea and the Bat

What if Poseidon had fallen in love with a male mortal? What if that mortal happened to be a hero? What if he was not only a hero but a billionaire? What if the sea god and the billionaire had children? What if the billionaire never knew? What happens when two of his children he never knew about appear in his city while he's on patrol? What happens when his sons meet their new siblings? What if Poseidon never told the mortal he was a god? What happens when the mortal happens to be the one and only Batman?

Disclosure- nothing belongs to me but the plot. And the cover belongs to https://twitter.com/smoustart?s=21