My heart sped up as she started to bend over--at the waist. Her legs stayed straight and parted, forming a triangle between her thighs that pointed straight to her muff. Mom had backed away from the shelves so far that she could now get her head below her waist while keeping her legs straight. What balance! Mom did enjoy her yoga. Her legs tightened, their firmness creating barely-there curves, but what made my heart speed up the most was action at the apex of Mom's thighs.

Her small, black cotton shorts had pulled tight between her inner thighs, forming a thick but thin thong while the back leg holes had...