"M-Morgan...! W-what did you do...?!" Robin asked in fear, glancing up at her sister, who had finally stopped reading.
"...What? WHAT?! What happened to your legs?!" Morgan asked, just as confused as Robin. "...Wait... it actually worked? Eheh..." The wicked grin that appeared on Morgan's face made Robin crawl back, but her new tail was quite heavy, lowering her mobility severely. "Oh... We'll have loads of fun, sis..."
"...but first I will have to come up with some way to keep you." uttered Morgan smirking at her sister. She turned her back on Robin and walked to her bed.
"What do you mean Morgan?" questioned Robin trying to pull herself to the door out of Morgan's room.
"Hmm..." Morgan sat down on her bed and laid down the book on her lap. Turning her attention towards her sister Morgan gave her a sickly sweet smile. "Oh, nothing much Robin. Nothing much. I just have to come up with some way to make sure Mom and Dad don't find out about this, you know." She cracked the book open and started leafing through it.
Robin started to frantically crawl towards the door.
"Ah, I've got something." crowed Morgan just as Robin reached the door.