MIRROR: Download from MEGA
RS: When you say 'whipping', do you mean flogging with a multi-tail flogger or using an actual single-tail whip? Single-tails are extremely challenging to use and to receive; they are not beginning level play by any means. If you have never done flogging before, start there and graduate up to single-tails after a LOT of practice.
When you do flogging (and whipping), you NEVER intentionally hit the lower back (the lumbar spine, the region below the rib cage and above the buttocks) because there's nothing to protect the kidneys. So when you flog her, you won't be directly striking the region with the pinched nerve. Instead, you target the upper back (the shoulders, shoulder blades, and so on, while not directly striking the upper, thoracic, spine). There's bone and muscle there, which means it's fairly safe to flog there. So in theory, you ought to be able to flog her upper back with no risk to her lower back.
That said, nerves are tricky things, and the place where the pain is may not be the place where the actual trouble is, and there might be spots in her upper back that will be flare the nerve. During flogging, some subs like to writhe around and struggle, which could also trigger the nerve pain.
I am not a medical doctor, so take what I'm saying with a dose of salt. But I think you could probably get a flogger and do some light flogging of her upper back. If that doesn't trigger her nerve pain, gradually go harder. I think you can flog her upper back without too much trouble if it's not triggering the nerve pain.
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