The house was quiet as Sarah tiptoed to the kitchen. She had heard her sister Emma talking to her friends about a party that she wasn't invited to. Sarah had always been the quiet one, while Emma was the loud and boisterous one who always got her way. But not this time. Sarah had a plan.

She quickly grabbed a packet of flour and poured it into Emma's hair gel. She smirked as she imagined Emma's reaction when she would try to style her hair in the morning. But Sarah didn't stop there. She also added some salt to Emma's shampoo bottle, ensuring that her hair would be a mess for days.

The next morning, Sarah woke up to the sounds of Emma screaming in the shower. She couldn't help but laugh as she imagined the scene that was unfolding in the bathroom. She waited patiently as Emma stormed out of the bathroom, her hair in disarray.

"What did you do to my hair gel and shampoo?" Emma screamed.

Sarah just smiled innocently and said, "I don't know what you're talking about."

Emma knew that Sarah was lying, but she couldn't prove it. She glared at her sister and stormed out of the house, still fuming.

Sarah couldn't help but feel a sense of satisfaction. She had finally gotten her revenge on her sister for all the times she had been bullied and mistreated. But she also knew that this was just the beginning. She had a feeling that Emma wouldn't take this lying down, and she was right.

As the days went by, Emma started plotting her own revenge. Sarah didn't know what was coming, but she was ready for it. She had her own tricks up her sleeve, and she wasn't going to let Emma win this battle.

The sisters continued to play their game of revenge, each one trying to outdo the other. But deep down, they both knew that they loved each other and that this was just a phase. They would eventually make up and move on, but for now, they were enjoying the thrill of the game.