"What d'ya think, Mark?" Riley taunted her brother. She was supposed to be spending the night studying for her college finals, but was using the time to torment Mark with what she was learning.
Mark was scared to speak his mind. Riley was almost a full-fledged witch now and could do whatever she liked to him. "You look good... But I don't-"
"Don't worry!" Riley held her hand out and Mark's mouth shut against his will. "I know you're jealous that I got all the good looks... and the brains... and the talent... But now that I have these abilities I can turn you into a gorgeous little Sister!"
His eyes went wide. So that was what she had planned for him. Even if his mouth wasn't sealed, there would be no point protesting. Riley was always a spoiled bitch and now there was nothing to stop her getting her way. She even used her magic on their parents to get them out of the house. Mom and Dad were turned into younger versions of themselves and sent out clubbing, leaving Mark at Riley's mercy.
There was a knock at the door. "Stay there and don't make a sound. Our dates are here a little early." She waved her hand and answered the door, welcoming in two men. They sat down at the table with her and seemed to pay no mind to him.
"Where's your friend?" One of them said.
Riley giggled. "She's almost ready, Nick. But while we're talking about Mel, what do you look for in a woman?"
Nick started to describe his perfect woman. With every description, Riley nodded and subtly waved her hand. Mark could feel himself changing, but couldn't look down to see for himself. His perspective shifted, as Nick talked about wanting a woman who was shorter than him. His chest grew tight against his shirt as Nick talked about bust. He could feel his jeans growing tight as well, as his hips and ass grew outwards. Then, the finish his transformation, Riley gave a final wave of her hand and he felt his hair and clothes shift.
"Oh, Melissa! When did you get here!?" Riley jumped up from her seat and gave Mark a kiss on the cheek, before whispering a command in his ear. "You are Melissa and cannot tell these guys who you used to be. You will smile and play the part of my slutty best friend."
She took his hand and led him to the table. Mark struggled on his feet for the first few steps, but Riley seemed to alter his mind to help him walk in heels. God knows what else she did to his mind. All Mark knew for now is that he couldn't stop smiling and even the thought of telling these guys the truth made his brain hurt.
So he sat down. He laughed at Nick's stupid jokes and played along with whatever Riley said. What harm was there in joining her for a double date?