"Do it," she says. And there's that command-and-obey thing going off in my head. It makes my dick hard as I make myself make out with my mother's asshole. My nose lands at the entrance to her vagina, so the scent of her there combines with the musky taste in her ass.

Mom's back to making her noises again. I swear I never heard my parents having sex in the house when I was growing up, and now she just cuts loose whenever. It might be some kind of turn on or torture meant for Dad, I'm thinking as I try to shove my tongue into her bottom. I'm grinding...