"Don't stop now, you bastard," Sue whispered, "I was almost there."

"Mindy's awake…and watching us," I whispered back.

"Who cares. It's time she knew about screwing," a giggling Sue answered, startling me with her reply, "fuck me now…I mean it!"

Unsure of what to do, yet wanting to finish this episode of lovemaking, I slowly renewed my thrusting. I could see Mindy quite clearly out of the corner of my eye. Her free arm was moving rhythmically and I could see that it was thrust under the sleeping bag cover. There could be little doubt that her hand was in her crotch…and that she was masturbating, her hand moving in time to the pistoning of my cock into her mother's cunt.

That thought was oddly exciting and I felt my prick swell to even harder readiness as I plunged it in and out of that dark wet hole. On and on we rutted…for by then it had gotten beyond lovemaking and had become pure animal sex. Finally I felt Sue shuddering and moaning under me. Her vaginal sheath gripped my penis tightly…began pulsing about it like a soft warm hand as she orgasmed…and I lost it, too.

Spurt after spurt of liquid heat jetted from me to fill Sue's tunnel to overflowing and I collapsed onto her sweaty body. My face was turned toward the spot where Mindy had been watching and I could see her lying now on her back, her knees up making a tent of the sleeping bag. Both her arms were under the bag and there was movement near her belly. I watched as her hips lifted from the floor of the tent…heard a small soft cry…and realized that she, too, had just experienced an orgasm.

We all fell asleep soon after, me still atop Sue. In the morning when we rose with first light nothing was said of the watching event…and the day proceeded in apparent normalcy.

2 – Fun and Games

That had been five weeks ago, and since each weekend since then had been perfect weather, the family had returned to the resort. Twice since then we fucked in the tent…and each time I knew that Mindy watched us. One of those times had been like the first…but the other had been with a naked Sue on top, straddling me as she fucked me with abandon…her little tits bobbing as she rose and fell.