With the right timing, I swapped the chair Miranda had been sitting on with the one I had prepared. Since the height was different from the original chair, if she had sat down like that, she would have noticed. So, I sat on the swapped chair. I carefully adjusted the height so that my thighs on the swapped chair matched the height of the original chair.
After the swap, Miranda sat back down in the same position she had just been in, but this time, on my thighs. Instead of a flat chair, it was my thighs. Instead of a hard backrest, my body welcomed her, but Miranda's mind stayed focused on her work, and the dwarf's characteristic of not being able to distinguish between soft and hard chairs, due to her dull senses, along with my [Sensory Block] skill that blocked the warmth and sensations she might have felt, worked in my favor.