Having absolute power over your sister felt intoxicating, so much so that you barely registered that your power could extend to much more than just your sister.
You thought about the many humiliating things you could make her feel and crave, say or do... And a lot went through your mind, but you decided to give her a few new fetishes and kinks, see your usually-prude sister debase herself with her new desires sounded thrilling, and amazingly arousing.
You felt yourself strain in your boxers as wild thoughts titillated your mind. It would be easy to make her share your own fetishes, making her utterly obsessed by them to the point where she'd be unable to function just thinking about them... Of maybe you could make her a hentai obsessed little goonette, jilling herself silly, day and night, watching anime of girls getting groped by tentacles, or sinking to their knees when they saw a well hung stallion.
You idly wondered how the veil would alter her if you set these new desires in her past?.. Only one way to find out.
"Emily, for as far back as you remember, you've always been deeply aroused by... "