Holy shit!!! Rosemary's Baby omegaverse AU?!? (I want)
BASICALLY the thought is that Graves is The Devil, living next door to Credence with his coven living in The Brand. And then one day sweet young Credence, getting his first apartment, escaping his mother and the terror of others, moves in. And Graves is instantly smitten, drawn to him. He’s never contemplated having children before (he’s above all that Alpha/Beta/Omega nonsense) but Credence is so pure and good and Graves wants him.
So he disguses himself as an Alpha and begins to gently but insistently take care of Credence. Helps him with groceries, helps him figure out the buses, sometimes even drives him until Credence goes instinctively to Graves as a mode of transport and assistance. Courts the sweet little omega, goes with him to church (when he takes the Eucharist the wafer turns to ash on his tongue and the wine to vinegar but no one would be any wiser).
Tina and Queenie and Jacob all know the plan and go along with it, gently coaxing Credence into coming over for more and more parties with their “friends”.
Then Credence falls pregnant. Dreaming of red eyes and a dark face and long horns and fangs and he’s sobbing and soiled and can’t remember through the throes of his heat who it was, it could have been an Alpha that broke in after following him home for all he knew.
And Graves, kind, understanding, loyal, gentle Mr. Graves who lives next door, tells Credence that he’ll care for him. Him and the baby. He gets to keep it, which is more than he could ever hope from any Alpha who knew him to be a fallen Omega.
And the pregnancy is terrible and Graves feels twinges of guilt, but when the first trimester ends and Credence gains weight, becomes healthier, feels the baby kicking and turning and developing, he can tell just how happy his Credence is.
And there’s no doubt that Credence is his.
But then Credence grows paranoid and starts putting together the pieces, starts noticing those things he had chosen to ignore, maternal instinct telling him to protect his baby, and suddenly Graves is chasing the boy across New York, dragging him back and accidentally inducing an early labor.
When Credence awakens Graves, worried about the boy’s reaction, gently tells him that he lost the baby.
When Credence finds his baby, with cloven feet and hands and bloody red eyes and black skin and fur and horns, he is repulsed at first. But a mother can never ignore the cries of their child and Credence is drawn to the black crib, to the small bundle swaddled in crimson.
“You want me to be his mother.”
“Aren’t you his mother?”
And Graves watches as Credence collects his baby in his arms, soothing the screams of the infant and gently kissing his baby, smelling himself and Graves and knowing in his heart of hearts that he would not change his sweet little one for the world and Graves could never part from them.
After all. God had chosen Mary, had he not? Why couldn’t Graves choose Credence?