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Her small, black cotton shorts had pulled tight between her inner thighs, forming a thick but thin thong while the back leg holes had ridden upward, baring about a quarter of her firm butt. I could see this new arrangement of her shorts, but she had to have felt it, and even though I knew what she was doing, chills of adrenaline rolled through my shoulders and down my arms. I shivered, feeling the light prickling of excitement bouncing across my skin like water sizzling over a hot surface.