Evan couldn't believe his sister was going this far. It was crazy enough she hasn't requested her breasts back, but to give up her shirt and bra so he can show off the goods.
He was strangely getting into this, like something had awakened in him. Was it always there or was this an effect of the power? He didn't care at the moment and just wanted more.
"Alright, but I want to reserve the right to undo all of this if I change my mind." he lied, having no intention at the moment to swap back.
"Sure, I give you permission to swap back everything if you change your mind... Now show me some hip!"
Evan decided to swap each part separately so he could enjoy each step. First he changed hip hips. He felt his bones shift, which was more unsettling than he imagined but oddly pleasant. He fell his hips as they tested the limits of his pants. His sister was what many would call "thicc". Something she got from their mother. Resting his hands on his hips to feel the shape he gave it a little jiggly to the laughter of his sister.
He moved on to the waist. He move his hands up so he could feel the change with his hands. He watched has his stomach pulled in thanks to Stephanie's regular workouts keeping a tight and flat stomach. His waist then began to pull in and give some nice curves to his shape. While Stephanie didn't have a six pack or anything, he could feel her well toned muscles as he ran his hand up her former stomach.
"Alright, here's comes the big change." he said bracing himself.
His rib cage made some slight cracking noises as it reshaped and completed his new hourglass frame. He gasps as things settled into place and the same unsettling but pleasant feelings. He was now more his sister than himself and found it very nice. Erotic even. He wasn't into incest but it wasn't like he was perving on his sister, these parts were now technically his for the time being.
Evan now inspecting his now further modified body ran his hands up and down and across his hips. Only to be disappointed. He realized his sister only gave him her hips and not her buttocks. While everything else was nice and curvy his backside was plain by comparison. He wasn't sure if he was more disappointed in having a relatively flat butt or just that he wasn't able to swap more.
His sister Stephanie saw his reaction when he patting his but and made the same realization. She was also enjoying this process but wouldn't admit this to her bro. After all it was weird to have parts swapped. Was the power affecting her in unexpected ways? They didn't know how or why he had these powers... maybe slow it down... or should we keep pushing the limits?
"Say bro... Evan." Stephanie said it with that special tone she used to get what she wanted. "Why don't we..."
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