The world they once knew was gone. Now they have to do whatever it takes to survive. So Sasha strikes up a deal with a savage, knowing she can use her one currency to get them out of this.
Her body.
She’ll stay with him, be whatever he needs, whatever he wants as long as he helps keep them safe.
And he agrees.
She’s now his … the property of a savage who will use her because he now owns her.