My Nudist Sister

They were in the master bedroom. Mom was naked, on the bed, on all fours, and Ellora was behind her, slowly penetrating her with a strap-on dildo.

My eyes widened in shock. Just like the night before, I knew that Elly could tell I was there, although she didn't so much as glance in my direction.

"Please," Mom was begging. "Please..."

I couldn't help but wonder if she was begging for her to stop...or for more.

Soon, Ell's dildo was completely enveloped inside my mother. She paused for a moment for Mom to adjust, and then began pulling out slowly, and slamming back in fast.

"Please," Mom panted, and a smile came across Elly's face at the request.

I stood there and watched as my baby sister fucked our mother. The strap-on was larger than I'd ever seen before, though I'll freely admit that I don't have much experience in that arena.

My mother's orgasms are, unsurprisingly, unfamiliar to me - she could have been having many small ones, or just gasping with enjoyment, but before long Elly was pounding into our mother as hard and fast as she could, and that's when I knew Mom was cumming.

As Mom came for at least the third time, she turned and looked straight at me. Like deer in the headlights, we were both unable to move, and stared at each other in shock. Elly, however, was clearly skilled with her toy, and before long Mom was cumming again, even as she stared into my eyes.

My sister took that as her cue to stop, and as she slowly pulled out, Mom shuddered - I wasn't sure whether it was whether in disgust at what she'd just done, or disappointment that the fun had ended - but Elly ran a hand up and down her back, before kissing her on the lips.

To my surprise, within a few seconds, Mom became the aggressor, taking her daughter's head in her hands and moving it firmly to her exposed breasts. I could see where Ellora got her tits from - even at Mom's age they were still pert and perky, and from the look on her face, she enjoyed Ellora's attention as much as Ellora had enjoyed mine earlier that evening.

As Elly sucked on our mother's tits (an echo of what she'd done as a babe, so many years ago) I took the opportunity to slip away. I sat in my room, perplexed and aroused by what I'd just seen. My cock was as hard as I could ever remember it being, but I didn't want to jerk off.

Not yet.

- - -

Instead of waiting for my sister to come to me. I waited for the sound of Mom's bedroom door closing, left my room, and met Ellora in the hall. Neither of us needed to say anything - at the hungry look in my eyes, she immediately dropped to her knees, and I pulled out my cock and started stroking.

I was so turned on that I expected to cum straight away, but to my surprise, it was almost ten minutes of tugging before I even felt my orgasm start to approach. Behind Elly, our parent's bedroom door opened, and Mom gasped at the sight in front of her; her only two children, sexually engaged. My sister nodded, so subtly I barely even noticed, and I immediately felt my orgasm approach, stronger than every other time.

Mom watched as my cock began to shoot, coating my teenaged sister's face and tits with my cum. None of us said anything as Elly got up, turned around, and passionately kissed my wide-eyed mother, covering the fresh clothes she'd just changed into with her own son's cum.

Somehow, I knew with complete certainty that she wouldn't change again. Ellora wouldn't allow it.

- - -

I heard my parents fucking that night.

It's not something I've ever heard before. The individual sounds were familiar to me: my father's grunts, my mother's begging.

"Please..." she moaned, so loudly that it echoed down the hallway and into my room. "Please..."

Presumably at some point they'd made love while I was living with them - how else could Elly exist? - but it wasn't something I'd ever experienced. After half an hour, my father gave out one loud grunt and my mother gasped one loud gasp, and for a few minutes there was silence.

Until they started again.

I suppose I could have closed my door, but something stopped me. After all, the sound wasn't offensive - it was just inconvenient. I was trying to sleep, but I couldn't, not with the volume. I wondered if Elly was having any better luck.

And of course, once that thought entered my head, I couldn't get it out.

Before long, I had slipped on a dressing gown and - ignoring the grunts, gasps and pleading of my parents - found my way to Ellora's room.

She was naked, of course. Not even covered by a blanket. At first I thought she was asleep, but after watching her for a few seconds, her eyes opened and she looked at me.

And smiled.

Before I knew what was happening, my pants were off, and my cock was buried deep inside my sister's beautiful pussy. It felt better than I could ever have imagined - warm, wet, tight, and so very inviting. I could honestly have cum within seconds, but my sister's eyes told me that she wouldn't like that, and so I held off, distracting myself by biting and sucking on her neck, leaving marks that I knew she'd get in trouble for at school.

Marks that I hoped she'd get in trouble for at school.

As I slowly pumped in and out of my sister's tightness, her skin began to get flushed. Her beautiful green eyes stared deep into mine, and my mouth moved to hers. Soon, our tongues were playing, entering each other's mouths, and I began to run my fingers down her bare back as I increased my pace.

I needed to cum. At that moment, I needed to cum more than I needed oxygen.

My sister's legs spread wide, inviting me to plunge deeper. Her pussy was sucking me in, sucking the cum out of me - the flush had reached her neck, her face. Ellora shut her eyes, and bucked her hips against mine - she was cumming, a fact that made me feel oddly proud, and her orgasm triggered mine.

Something primal overcame me and I couldn't help but cry out as I climaxed - not words, just a feeling of absolute pleasure and achievement. My cock twitched, and I filled my nudist sister with my cum as her pussy clenched repeatedly, and her entire body flushed red.

Rolling over, I held her in my arms for a few seconds before I looked up and noticed an unusual sight:

Standing in the doorway, totally nude and looking at us proudly were our parents. Ellora sat up and a smile came across her face. No one said anything as Mom and Dad came and joined us in Ellora's bed, the four of us naked, hugging, as sleep came over us...

- - -

One week later:

I smiled down at Mom, who was dutifully licking my cock every time it slid out of Ellora's perfectly-trimmed pussy. Ell's mouth was busy deep-throating our father, and he in turn was going down on Mom.

It was my last night in town. I sure was going to miss catching up with the family.

My cock twitched as I came inside my sister; I could tell from the flush spreading across her body that she was still approaching orgasm, but as I pulled out, Mom's mouth quickly cleaned me off before she turned her attention to Ell's now-empty pussy.

I watched the three-way with satisfaction for a few minutes, before my erection returned. Mom must have seen it out of the corner of her eye, because she wiggled her rear, and it wasn't long before I was pumping my seed into her tight ass while Dad filled Ellora's mouth with his spunk. We all paused to watch as Ell reached an orgasm of her own, but once it passed, we picked things up again.

They were going to miss me when I went back to college, but not nearly as much I was going to miss them.