I'm Dad's Guinea Pig

My sister always got away with everything, so I naturally became Dad's favorite guinea pig to make an example of. When we were little, my sister refused to eat vegetables. He threw me into the bathroom, locked me in for five days without food, and starved me until I vomited blood. My sister was so terrified that she never dared to be a picky eater again. When we got older, she became obsessed with video games. Dad tied me to the computer and ordered me to play nonstop for thirty hours until my eyes bled. My sister swore she would never touch a computer again, and only then did he stop. Later, once puberty hit, my sister refused to wear thermal underwear. When Dad found out, he threw me into the freezer at our family-run supermarket. Facing my sister's stunned expression, he simply shut the freezer door. "Nicole, today I'm going to show you what frostbite looks like! Let's see if you dare disobey me again!" "Dad!" My sister dropped to her knees. "I know I was wrong. I really do! Please let him out!" No matter how she begged, Dad remained unmoved. I collapsed onto the floor as the freezing air slowly seeped into my body. Feeling my heartbeat grow weaker and weaker, I finally forced a bitter smile. 'Dad, I don't want to be your guinea pig anymore.'