Thanks for the nice comments, Ruby, Mad, M0 and Jasmine!
It makes me happy that you like it.

The bondage question is interesting. Perhaps I’d need to improve the description to clarify. It is meant to be nasty under the control aspect, of course. I had envisioned him resting his buttocks on the heels, with the tops of his feet flat on the floor. What the Japanese call ‘seiza’. The floor ring should be big enough to lean up against his genitals. That way, if the lock is not heavy, he would not feel much more pull than the ring he is carrying all the time. Otherwise I would have had to write in all these pain sensations – too distracting.

I don’t want him to be a complete stoic. Where’s the fun in that?

Is there a ‘next’? At present there is not. I don’t know yet whether I will expand this in writing. It was merely composed as a vingette. I need to think about it... shameless begging noted.