A bit more fun

"James, there's a hole over here that needs plugging," I said, slapping my daughter playfully on her behind. A dirty big grin spread over my son's face and he walked over to line his cock up against his sister's rear end.

"Oh," said Lucy, her eyes wide as she realised what we were going to do. "Oh no, I'm not sure I w..." Her eyes widened still further as I spread her butt cheeks and James's hard cock pressed against her anal sphincter. "Oh," she said again. "Oh, no, o...oooooh, that feels quite nice actually. Mmmmmmmm, it's so big, so hard." My own dick was still buried in my daughter's pussy and I could feel my son's cock making its way into her anus through the walls of her cunt. The muscles of her vagina contracted and relaxed, her oversized tits pushing against my chest.

"Oh, yes, Jim, slide it in further," instructed Lucy. James complied, slowly, and began to thrust gently in and out. Lucy's vagina gripped my cock harder as he did so, while I just sat and let my kids do all the work.

I looked over Lucy's shoulder to see Jim's face; his mouth hanging slightly open and his eyes dancing with delight. He paused his humping momentarily to let rip with an enormous fart.

"Oh, that feels good," he said, catching my eye and smiling broadly. I farted too.

"Sure does," I replied. "Now let's speed things up a bit." James complied, thrusting harder into his sister's arse. She was panting and squealing incoherently now as together we ravaged her.

The walls of her pussy gripped my dick tightly as James relentlessly pounded her anus, my daughter's tits jiggling joyously against my chest. Kirsty had her fingers buried in her own cunt, pleasuring herself as she watched the spectacle of her family heaving lustfully together towards another astounding climax. Kirsty wondered over, leaned towards me and we snogged. Then she turned her attention to our daughter, kissing her fully on the lips and exploring her mouth with her tongue. Then she moved towards our son and exchanged a long, lustful kiss with him too.

James clutched Lucy's buttocks, one in each hand, as he came noisily in her arse, yelling "oh yes!" as he did so. Lucy's pussy seemed to grip my cock even tighter as she came in time with her brother, and this knocked me over the edge too, once again spurting my semen deep inside my daughter's snatch.

After a brief pause, James steadily withdrew his cock from his sister's gaping arsehole, and Lucy slowly stood, allowing my dick to slide out of her pussy. Her fingers immediately took its place, scooping up the mixture of her juices and my semen that was dribbling from her ravaged vagina and licking the fluid from her fingertips.

James blinked a couple of times.

"This is all a bit... weird," he observed. "I mean - good, lovely, but weird. Why are we all do horny? Why are our dicks so big? And your tits?"

"Yeah, what's going on, Mum and Dad?" echoed Lucy. "I've never felt so sexy, so horny, so..." she paused to release a huge fart from the hole her brother had been fucking just a few moments ago.

"...flatulent?" James completed her question for her with a cheeky grin on her face.

"I think it's time for us to open that box," I answered.