Ryan went upstairs to give Erin her doll. He opened the door slowly in case she was playing in the way of it, and peered in. He saw Erin was sleeping, and noticed the smile on her face. Ryan looked down at the doll, then back at Erin. Both had the exact same smile.
Getting an idea, Ryan stared intently at Erin's mouth and whispered to the doll, "You should frown now." He saw Erin's lips twitch, then settle back down into a frown, exactly like the one on the doll.
Ryan had to confirm his suspicion once and for all. He whispered once more to the doll, saying, "you now have blue hair." Obediently, the doll's hair changed to a light shade of blue with a tinge of violet.
Ryan was amazed: he had a voodoo doll of his sister, but it could actually change physical things about the target.
Ryan closed the door as gently as he could to not disturb his sister, then raced down the hall to his room. After locking the door, he sat down on his bed and studied the doll. After a few moments of thinking, he told the doll, "Every time Erin wakes up, you will revert all changes I made." Ryan wanted to be sure that anything he did wouldn't be discovered. Plus, if he really wanted to make a permanent change, he could just undo that command.
After a few more moments of thinking, Ryan said...