>>11343225
Yes there is a proper technique lmao. I do recommend learning it so you can teach it.

I don't see how cardboard would help. Maybe if the floor is dirty and you don't want your shins to get dirty? The thing about seiza that makes it difficult is the ankle stretch. You're pressing your entire body weight down into the ankle stretch for extended periods of time. Padding under the foot doesn't help you, it just deepens the stretch.

>I am pretty positive I was pushing all my weight onto my knees, which was probably the critical part where I went wrong.
Yeah, almost no weight should be on the knees. My guess is you're sitting on the balls of your feet rather than the tops. Also maybe look up seiza chairs. Seems worth mentioning.

>A slave is just never going to want to complain about anything, so is unlikely to be able to properly communicate to who owns them that it is way harder than they think.
This is very true, and communication is very important, with any sort of play. So communicate, and order them to do the same. How exactly to do this is a matter of experience and largely beyond the scope of this 4chan conversation, but there are plenty of guides out there.

>Even if you've done some rather big damage to yourself practising kneeling
I've destroyed my knees and ankles accidentally for practice, and on purpose for punishment. I know that I can recover from ankle strain. I'd rather have ankle strain than a stain on my pride as a submissive for having not atoned. By the time She allows me to move, I know that I'm forgiven.

I have a kink for it specifically. We communicated beforehand, and I let my mistress know that injuring myself kneeling for Her was something I was interested in. I don't imagine that most slaves or submissives would be okay with partaking in something like this, especially without knowing what they're getting into. Injury, even temporary, tends to be a limit for most people by default, and trust is most important. So talk about it.