For a moment I thought I might be persuading her, because she kept pressing the mound between her legs against my finger, which I pushed against her, trying to get her off through the cloth of the shorts. But then she pulled away and looked me in the eye.

"Randy," she said. "We set some boundaries. You know that. And as much fun as this is, I want to keep those boundaries and I want you to respect them. OK?"

"But why, mom?" I asked. "Look what we're doing here. Think about what we've been doing. I know you like it as much as I do. It would feel so...