Yuki couldn't see it, but she felt the moment when the teacher's arm was raised, and instinctively squeezed her buttocks.
Not that it did much, the impact made her moan, causing her to give an instinctive jolt that led her to straighten the back.
Yuki was sure that this woman was a sadist. That was her thought as she bent her back again, quickly, before the teacher took her back for that too. Her skin was already tingling unbearably.
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