The Alchemy {book 1/2} MCU x PJO

"What if I told you I'm back?
The hospital was a drag
Worst sleep that I ever had
I circled you on a map
I haven't come around in so long
But I'm coming back so strong"

Rebecca Warren was always a bit too much. Too loud, too demanding of attention, too there. She never saw a problem with it, but her parents did. Donna and John Warren were always so worried about Rebecca's "problematic" behavior and never actually just her. In a world of moves and counter moves, Rebecca only ever felt cared for with Tony.
Anthony Stark, heir to the Stark legecy and heart throb of MIT. But to Rebecca, it was just Tony, her honorary big brother. Tony has been there as long as she can remember, since their parents were friends.
But what happens when Tony is missing and she only has her annoying client to turn to?

OC x Wanda Maximoff