We were talking about blowjobs (you know typical conversations for us) and he said that he absolutely needs my hands working his cock as well as my mouth to make him cum. Seizing the opportunity for a challenge, I told him I was confident that my mouth alone was all he needs. Of course it had to be documented for proof and potential bragging rights. The rules were that neither of us could use our hands and it turned out to be a pretty sexy and fun challenge.