Suddenly, my mother's childhood friend, Reiko, came to our house. She was a beautiful woman exuding a mature charm that made her seem far older than my mother, carrying with her an almost mysterious aura. Her demeanor hinted at some special circumstances, leaving me instantly flustered. That night, I accidentally saw her alone in her room. She sat gazing down at her crotch, gently stroking herself with a melancholic expression, lost in thought. I felt both confusion and arousal at the sight.