The Girl That Lives in Two Worlds

What if the Tony Stark got a woman pregnant years before he became Iron man. A woman that in fact was from another world. No not from outer space, but from a alternate universe.
One that was only able to be accessed from a portal at the very bottom of the Mariana Trench.
And what would you say if that woman was Atlantan, and the little sister to an Author Curry.
But what happens when Tony finds out he has a daughter. And the Avengers all find out about the portal.
How will everything turn out?
Will Tony get a relationship with his daughter, or will it get worse then it already is?
How will his daughter react to meeting her dad?
How will the Justice League react when a certain group of heroes visit?
Well you'll need to read to find out.