Sometimes I dream about Mira. About the life I left behind. About a version of Nina who died and a sister who lived.
Sometimes I wake up and forget which world I'm in.
Nina watches me now with careful eyes. Like I'm one of her experiments. Like she's waiting to see if I'll break.
Maybe I already have.
Last night, she came to bed late. Sat on the edge, not looking at me.
"I'm going to destroy it," she said. "The device. I'll publish the theory but never build another one."
"Why?"
"Because I saw your face when you looked at her. At Mira." She finally met my eyes. "I sent you to another dimension and you found another version of me to love. That means something. Either I'm replaceable, or you were never really mine."