The sister's fists flew through the air, connecting with the punching bag with a satisfying thwack. She was in her element, her muscles moving in perfect sync as she pushed herself to the limit. But suddenly, with a loud rip, the bag split open, its stuffing spilling out onto the floor.
She stopped mid-punch, her eyes narrowing as she looked around the room for a replacement. Her gaze landed on her brother, who was lounging on the couch, a book in his hand.
"You!" she snapped, pointing at him. "Get up and help me find a new punching bag."
He groaned, but didn't move. "Can't you do it yourself?"
"No," she said firmly. "I need your help. Now get up."
He sighed and pushed himself to his feet, grumbling under his breath as she tied a rope around his waist and attached it to the ceiling.
"Stand still," she ordered, stepping back to assess her work.
"This is too uncomfortable," he complained, shifting from foot to foot.
"Stop being such a baby," she said, rolling her eyes. "It's just a little rope."
She stepped forward and started punching him gently at first, testing his stability. But soon her blows became harder and faster, her fists connecting with his solid form with a satisfying thud.
He yelped and tried to wriggle free, but she kept him in place, her eyes sparkling with amusement.
"Toughen up," she said, landing a particularly strong punch that made him cry out in pain.
She laughed and continued punching him, her blows becoming more and more intense. He begged her to stop, but she just laughed and told him to take it like a man.
Finally, she landed a devastating punch that sent him falling to the ground, clutching his groin. She looked down at him with a satisfied smirk.
"Well, that was a good workout," she said, untying the rope from his waist. "Thanks for being such a good sport, brother."
He groaned, rolling over onto his back. "You're going to pay for that, sister. I'll get you back somehow."
She just laughed and walked away, leaving him lying on the floor.
"We'll see about that," he muttered, plotting his revenge as she disappeared from sight.
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