What if you had a nifty gadget that could change your sex or the sex of anyone you pointed it at? Think of the fun you could have, turning yourself into a woman for an hour or two, or for years. Think of the mischief you could do, turning men into women, and vice-versa. Bored with your lover? Turn her into a man and yourself into a woman, then try again. Looking for revenge? Turn that scumbag you despise into a woman for the rest of his life.
One night my sister crawled into my bed for comfort after watching a scary movie. We chatted, we cuddled, then Keira seduced me, which I think was her aim all along. Since that time, we've grown closer and events have been very kind to us.