Not just his brother, his little brother! You stare at the middle-school kid in the mirror, horrified that you will have to take all those boring classes over again. Except that when you try to think of all those clases, you don;t remember what you learned. Even your memories have become 13 years old!
Your tight jeans feel normal now, and you look down to see an impressive bulge, especially for a kid just entering puberty. You unzip and find that you aren't wearing any underpants as a soft, thick, and uncut eight-inch Italian Sausage flops out. The hairless balls underneath are also bigger than what you had before. If this is what you are starting out with, you'll be hung like a horse when you are 15 again!