Tim's sister had persuaded him to dress as a schoolgirl for the day. He loved it, he loved the attention he got from boys and soon he and his sister's friends were alone in class with some of the senior boys.
You've got to do it Tim, his sister giggled, they'll get suspicious otherwise. We all do it.
Tim knelt down and prepared himself. But as a senior walked up to him and took his cock out he couldn't believe it. He had no idea they could be that big.