She smiled down at me. I was sitting in the chair while she stood before me.
"You know the rules," she said sternly. I swallowed hard and nodded to her.
My mouth was already dry and the words came slowly, as they always did. "Please Mistress, hurt my cock and balls." She grinned. "There is no way for you to stop this once I start. You understand that, right?"
I nodded and whispered a quiet "Yes Mistress."
She drew my hands behind the chair, where they settled into a pair of steel cuffs, totally immobilizing my arms. Her foot pressed a pedal and the chair tilted back forty five degrees. Two steel tubes were screwed into the sides, where my knees were cuffed and attached.
Two small snaps and half the seat disappeared, leaving my cock and balls free and dangling. Knees spread wide, hands tied, totally helpless.
First, she placed a set of three steel rings on my cock, which was half it's size compared to when erect. Even so, the rings were a tight squeeze, requiring a little baby oil to position them properly. Next, she took a long piece of wet rawhide leather and began binding my balls, slowly winding it tighter and tighter, until my balls were trapped and swelling.
She pulled up a chair beside me, smiling. "For starters, just to get warmed up, I'm going to let you do this one to yourself."
She smiled. "I just wouldn't get hard." She held up a pair of her panties and pressed them against my cheek. "They are still wet, can you feel that?" She wiped them over my face, lips and nose. The scent alone was enough to cause my cock to swell, constricted by the rings and leather bondage.
She giggled, peeking down at my erection. "Awwww, who's my little panty boy?" she teased.
"I am," I whispered breathlessly into the damp panties.
The pain in my cock added to my excitement, causing my erection to grow more. The rings trapping the blood in my cock made the erection grow more, adding to the torment. I began to feel the effect of the leather as well, contracting as it dried.