A high-school student comes to terms with some remarkable abilities, and learns that all the Newtons and Joules of the universe can not solve the problems at the frontier of the human soul.
Sophia didn't mind that both of her parents seemed to like looking at her body. In fact, she liked it. It turned her on. It did no one any harm, and they all enjoyed it, so why not? Until something changed that left her wanting more.
How many brothers and sisters have gone through that rite of passage? A lot, I suspect. But with most, it stops there. But circumstances conspire so that Cassie and Shaun see each other again and again as they both get older. Like it's fate, or something...