Megan glared at Kyle, presumably trying to decide whether he was serious. His grin must have convinced her he was, since she replied in a voice strangely devoid of emotion, "Transform". That gave Kyle a pause, he had a whole thing concocted for when she picked dare. He was going to dare her to listen to every single thing he said, essentially be his slave, but she went and picked the route he didn't think anyone would go.
Megan for her part, grinned internally. When she had said everyone had thought about it, they really had, and she had made the decision that she'd rather change physically, than mentally, long ago. She might not have control over what happened next, but her brother clearly hadn't been expecting Transform, and he only had a minute to come up with something, otherwise it would backfire.
Forty seconds in, Kyle was panicking, and it was showing, he wanted the transformation, to be good, but he couldn't think of something quite the level of what he had before. Racking his mind, he arrived on the book he had been reading when Jen called, and there, he found the answer. "For your transformation, you will turn into one of the Djinn. As a Djinni, you will be bound to an object, let's make it a ring, and must fulfill any wish made by the one wearing the ring." As Kyle finished, Megan's entire body shimmered, and seemed to melt into the air, her clothes dropping to the ground. Wispy tendrils of smoke swirled around in a cyclone, dancing and whirling through the air. Then, it stopped. As quickly as it had started, the tendrils funneled into a newly formed ring, still red with heat.
Kyle watched, pleased with himself as the ring quickly cooled. Holding his hand over the ring and feeling no heat, he picked it up and studied it. A gold band with patterns engraved upon it, it didn't look too impressive. Slipping it on, he felt it heat up noticeably, but not uncomfortably. With it on, he instinctively knows how to summon Megan, and does. Watching smoke drift from the ring coalesce into a human shape, before solidifying into Megan, nude now much to Kyle's amusement. She looks down at herself before blurring into smoke, reforming with clothes on. "You have always looked down upon me, controlled me, and ordered me around," Kyle begins, "but now, now I am in control. Now it is you who must listen to me, you who is the slave to my will! This surely is a fitting punishment."
Throughout his speech, Megan leaned back against the wall, folded her arms, and smirked. As Kyle watched it, he grew more and more irritated, here he was, controlling her, reducing her to nothing, and yet she still was acting superior! At the end of his spiel, she grinned at him, and said, "Eh, it's not that bad." Kyle stood there in furious shock. Feeling for the link within the ring and pushing power through it, Kyle screamed, "Stop talking!" Kyle's younger sister opened her mouth, then stopped and shrugged, relaxing back into reclining position, once again with the smirk decorating her face. Kyle, breathing heavily, glared at his sister before dictating directions at her, "I wish that no one will be able to remove this ring from my finger, nor separate my finger from my body in such a way that I will lose access to it's power, understood?" Megan, nodded, rolling her eyes. "I also wish that no one would notice the ring." Megan lazily flourishes her hand, then taps on a watch that wasn't there a seconds ago and yawns, clearly taunting Kyle. "Begone!!!" Kyle screams, glaring at the steam as it lazily swirls back into the ring.
Kyle stands there, then sits down, he will have to punish her. She is insolent, annoying, and brash, but he just has to remember... She is under his control.