"Sorry, I couldn't resist being the first to penetrate her back door," Mom apologized, as she slowly fingered her mother's ass.

"I may have to punish you later," I teased.

"Punish away," she purred, sliding her finger out and returning to her seated position in front of Nana.

"Ready Nana?" I asked, as I moved behind her, my cock stiff as a rod, and ready for this once-in-a-lifetime opportunity...to take my Nana's anal virginity.

"I'm your Nana-slut," she said with a wicked smile, "Use me as and when you wish, Master."

"Good answer, you sexy vixen," I nodded, as I rubbed my cock up and down her ass crack.

"Just...