Kat and I are sixty-nining on the couch. She is frantically humping her cunt on my mouth in ecstasy. I, too, am close to cumming, but we are interrupted by my youngest daughter, Kimmy. We darted to opposite ends of the couch as Kimmy burst through the front door, quickly running upstairs to the bathroom. Kat slid over my lap, mounting my cock, and began riding it fast, trying to bring us off quickly.

"What do you want for your birthday, Dad?"

I pointed upstairs, saying, "Your sister."

Kat smiled, "I can deliver that."

We both came thinking of Kimmy.