I ran out of toilet paper and left a cardboard cylinder. I was very interested in what would happen if I put it on my stepbrother's penis. I offered it to him and he agreed. His cock was very soft and I inserted it into the cylinder. Then I caressed his testicles and he was very excited. His cock became very hard. The cylinder held him tightly. I caressed his head. And a real volcano of sperm burst out of it. It was very impressive! I was thrilled!