"Here's the deal, Ash'" Matt began. "I'm feeling surprisingly generous at the moment. Instead of changing you at my whim, as I've been, I'm offering you a deal."
This only served to confuse Ashley. After all, why would Matt, who had just went out of his way to display his absolute control over her, being willing to compromise? It just seemed wrong. Regardless, she responded, frightened more by the consequences of inaction.
"What do I have to do?" she responded warily.
"Here's how it goes: Since you needed money earlier, I've decided that for each physical change you allow me to make, I'll give you cash. How's that sound?"
"Um, not to look a gift horse in the mouth, but...Why are you doing this?" she questioned.
Matt gave a mischievous shrug in response. He had two reasons, both of which he'd kept to himself. First, her apology had sounded somewhat sincere, so he felt she deserved some shred of leniency. Most importantly though, he was curious. Matt knew Ashley well, and if there was one thing she didn't have, it was self control. She was the type of girl that would take a box of chocolates and eat the entire thing in one sitting without even thinking. He couldn't even imagine how she'd handle being able to modify her own appearance.
With the deal set, Matt ushered Ashley out of his room, ordering her to change into something less "constricting". Unsure of exactly what he meant, she departed for her room. Now alone, Matt quickly assembled an impromptu transformation stage using a couple of mirrors to allow full viewing and miniature foot stool as a base. It was a crude creation, but it worked.
As Matt finished tweaking his design, Ashely returned. She had exchanged her tank-top and skirt for a black bikini. An odd outfit, but this was as "non-constricting" as she could get without going fully nude. A smile beamed across Matt's face upon noticing his experiment had returned.
"Well, I suppose that works. Now, please, step onto the stage and let's begin!" Matt ordered. She promptly complied, allowing him to guide his scantily clad step sister onto the "stage". As he helped her into position, he thought on the first change to suggest. Ultimately, he decided that..."