bart simpson hood

I'm my brother's walking blood bank. Mom and Dad keep forcing me to go for blood transfusions to the point that I don't even weigh 80 pounds. Later, my brother's kidney fails. Mom and Dad want to gouge mine out to be transplanted into his body. At the peak of my despair, the thief who sneaks in from the ventilation hood secretly carries me out and helps me escape. He says, "I'm here for you. Don't be scared."