Despite your mind showing you a myriad of different scenarios in which allowing your deeply kinky sister this power over you could go bad, you knew one thing and one thing only...
The idea made you so, unbelievably hard.
"So...Emily uhm... What if you could act upon these fantasies and... Turn me into a girl?" you say tentatively, a deep crimson blooming on your cheeks.
This was enough to snap your sister out of her self-pleasuring haze. Her attention immediately went to you, and her lips stretched into a stunned smile. "If I could turn you into a girl? Gosh I... I'd want to do so much." she says, standing up and walking seductively towards you. With a sly smirk, your younger sister looks down at you, sitting in her chair, and puts her hands on her hips triumphally. "What? Did my big brother just realized how horny it makes him to imagine himself demoted into my humiliated, weak, petite girl toy?"
You felt a jolt of excitement in your loins to see your normally reserved and prudish sister lord over you, promising humiliation and pleasure that made you squirm.
" Yes... I uh.... I'd like that. " you replied meekly.
She nodded with a little smirk. "You realize that for this to work, you have to give up everything? All the power the Veil gives you over me?" She brings her face close to yours, her hot breath on your neck feels like thousands of pleasurable pinpricks. "Once you do, there's no going back. You realize that don't you?"
You nod shamefully. "I... I know. I know what it means."
"Good!" she giggles. "I couldn't have asked for a better gift... Now, I want you to repeat after me while holding the veil: My sister has the power to transform me, and any male she sees into a girl."
Reluctantly, you repeat her words. "My sister has the power to transform me, and any male she sees into a girl." Feeling the Veil tingle in your hand as you bestow her with the power she craves.
She obviously can barely contain her excitement. "Again." she says. "Repeat after me: in five minutes, I won't remember any of this, and I won't be aware of any of the wishes that have been said today."
You shake your head. "Wait what? Why would I do that!" you say, outraged.
She caresses your chin softly, her delicate fingers rubbing against the nascent scruff of your beard seductively. "You want this to be good for me too, hmm? I want you to be surprised by it... I want you to shamefully discover how wet it makes you to be a girl... I want to tease and humiliate you, and that... Won't work as well if you know how much you want it, hmm? "