We had gone around the side of the house to the backyard, where mom kept a key to the house under a pot. While mom was stretching against the wall, I put my hands against a patio post and stretched my calves. I wrestled with the desire to look at her behind, and I tried to focus on my stretching. But I didn't succeed. Mom was turned the other way, giving me the chance to sneak a peek at her without her knowing. So, I did. The first thing I noticed was the way her firm, round bottom stretched against the thin nylon of her short shorts. Each cheek was...