The trouble with being an Operative for the Time Core, wasn't the intense training, it wasn't the full body sickness after the time jumps, nor the crushing loneliness of a solo research mission to the past. It was being ten thousand years away from a decent coffee.

I had been on temporal assignment for three months. Three months in the indus valley circa 10,000BC The cradle of civilisation. And not a Starbucks in sight.

I had been tracking a family unit of early humans as they migrated, and it had been fascinating. There's not many career paths that let you watch our ancient ancestors walk the path of our evolution.

To even be considered for a temporal assignment you had to be the best of the best. And then the best one of those. It cost billions to send even a one person pod, so they were very keen to get it back, and that meant a pilot not only had to be tough enough to survive in the distant past on their own, they had to have the smarts to operate quantum technology, with no back up or assistance. I had attained my first degree at eighteen, mastered in quantum theory by nineteen and by the time I was twenty four I had PhDs in temporal physics, quantum theory and applied causality. Not too shabby. But being a dickless woman I had to go above and beyond when I entered the Temporal Incursion Taskforce’s academy. I was fitter than the nerds who matched my qualifications, and I was smarter than the flyboys and marines who edged me, only slightly, in the physicals. I'd been pushed to every limit, from solving temporal equations after marathon length runs, to two week endurance hikes through the Peruvian rainforest, to pathogen trials, where I was injected with horrible, yet non lethal diseases and sent on my own, into the wilderness. They were the worst, but I was one of a handful still left standing at the end. I was the ideal candidate to be sent, and yet still, still, I had to suck a literal dick to get here. I remember the meeting, the director and I, the negative energy in the room. I knew from the start he didn't intend giving me the assignment. So I'd walked around his desk pulled him to his feet by his tie, looked him in the eye and told him, “ I am about to put this big dick,” the one I had gripped through his trousers, “in my mouth and by the time you're done shooting your cum down my throat, you're going to want to do anything you can to repay me.” I hated that that was what edged it for me but hell, I'd have sucked every dick at the T.I.T if it meant I got to be here in the valley. Do you know what else was 10,000 years away, as well as good coffee? Good dick.

The jump was every bit as awful as I'd trained for.

The mathematics involved were insane, the quantum manipulation of the time jump were almost unfathomable. The calculations for earth position in space time at the target date were mind boggling. But we did it, and I'd have to leave at a precise date and time to assure my return pattern.

The scariest part of the jump itself was the free fall after materialisation. The scientists were only able to guarantee I wouldn't end up encased in a mountain by dropping me at 50,000 feet and letting me death dive from the stratosphere. All while vomiting intensely from the immediate time sickness.

It had taken me three days to get used to the time sickness and the thicker, oxygen rich air of this period, before I could even think of tracking a subject. But now, three months into a two year study, I had found a family of homo erectus on a migration route. I followed, day after day, in my ghillie suit, stealthy and unseen, monitoring family dynamics, behavioural patterns and the habits that had seen us safely evolve into the modern versions of ourselves.

The pack contained two infants, barely walking, the mother, an aunt I guessed, probably sister of the elder male as they didn't relate affectionately in the way the elder male and the mother did. An adolescent male, barely 16 at a guess and another male, just entering full adulthood. Interestingly there was also an old, lame grandparent who was cared for and moved around on a rudimentary sled, proving many theories of family dynamics.

It was fascinating watching the family interactions. The kindness and care afforded to ‘Grandmother’, the obvious affectionate gestures between ‘Mother’ and ‘Father’, deference to Father from the younger ones, all though it was getting more obvious that Eldest was beginning to challenge Fathers authority. The petulance and obvious grumpiness was almost comically similar to modern day adolescents moving into adulthood.

Eldest was fast becoming my primary subject. Every time my binoculars scanned the group, they always settled on Eldest. The graceful power of his movements, his savage, brutish look. It was often during the loneliest parts of the night my thoughts would wander to the secret behind his loin cloth. Thoughts like that would have had me out of the T.I.T so fast my feet wouldn't have touched the floor. It was 18 months ago 10,000 years in the future since I'd had sex. Temporal language and sexual frustration were really messing with my brain.

It had been assumed youngsters would break off from the family dynamic at a much younger age than Eldest’s 19 or 20, but either familial bonds or lack of suitable mates had kept him in the group.

I watched, concealed, from a slope a hundred metres away as Eldest looked to be setting out to make a hunting/ foraging trip. The last time, he had set out on his own for two days, I had stayed with the main group. This time I would shadow and track him and observe hunting patterns and tactics.

He was strong and agile, so I'd have to ditch my main pack, my bivouac and camouflage ghillie suit just to be able to keep up. I wore a dark green body suit made from a breathable soft armour polymer, thick soled knee high hiking boots, my dark hair, kept short at chin length, was tucked up in the hood and my face was blackened to match. If I kept still I'd be able to fade into the undergrowth easily, and I packed light enough to be able to match Eldest's speed. I carried only a few ration sleeves, a few survival essentials, and my stun stick strapped to my thigh. On arrival I had launched a stratospheric halo drone to provide my electronic mapping and positioning, and that data was sent to my only other bit of kit, a solar powered view screen mounted on my wrist. I set a digital beacon on my position, so I would be able to locate my main kit on my return and waited to see in which direction he would set out.

We trekked for hours. He was fast and agile. Lithe muscles moved fluidly under his deep bronze skin. He was not much taller than my 5”6, but thickly built. His nakedness is only covered by an animal skin loincloth at this time of year, and I watched from afar and admired his grace and strength once more. His beard,not yet at maturity, gave him a rugged, wild, savage look. His brow slightly bolder, his face slightly rounder than modern humans. I decided he was quite handsome as I observed through powerful binoculars. He may be my great, times four hundred, grandpa, but he was very fuckable.

The skies had darkened all day and I feared another torrential storm for tonight. The first fat drops landing at my feet, kicking up plumes of dust told me I was right. He had felt them too, I surmised, as he had set off again towards the not too distant mountain. More than likely in search of a cave or overhang to provide shelter.

I followed. I hoped there would be a choice of natural shelters in the rock face, so I could find one and also observe wherever Eldest found cover. I pinged the mountain with the stratospheric halo's sensors and determined there were several likely caves within the mountain face. Wherever Eldest went, there'd be other nooks to ride out the storm in.

The rain had started in earnest. I was immediately soaked, but my advanced polymer body suit kept my skin dry as the downpour washed away the blackening on my face. I had to rely on the sensor array to track his heat signature as the visibility in this monsoon was virtually nil. The rattle of the rain on the leaves and the blinding sheets of rain made me quite disoriented. The display showed him head into a cave system at ground level, so I circled slightly, and decided on a potential opening a little way further up, that had good sight lines over his hideout.

I scrambled up the scree of the slope, eyes stinging and body sore, and found the entrance. There were no signs of habitation, no animal prints or signs of life so I felt safe pushing into the pitch black cave. In my survival pack was a Davidson heat lamp. A small, high energy emitting, fold out heat source that ran off a degrading ion generator. I felt safe and deep enough into the cave to set it up It would provide as much light and warmth as a regular campfire, without the smoke and effort.

The warmth was immediate so I set about stripping my wet gear off to dry. I sat on a boulder and uncliped the length of my combat boots, heaving them off first. It felt good to free my tired feet, and I scrunched my toes in the dry earth.

I pulled my hood down and bent over, ruffling my short hair back to life. Facing the warm orange light of the lamp, shadows danced mesmerically around the cave, I reached up to the collar at my throat and pulled down the zip.

I stood and bounced on the spot, to shrug out of the skin tight bodysuit. I felt my breasts bouncing in my compression bra and didn't hate the feeling.

I pushed the suit down over my thick buttocks and down my thighs, a rich orange colour in the light of the lamp. I stepped out of my discarded suit and looked around for the best place to lay it to dry.

My eye caught a shadow in the doorway, a subtle movement and I focused there. I suddenly felt intensely vulnerable, in just a half length compression top and matching navy thong underwear. My stun stick was in reach so I bent and retrieved it. The shadow moved closer, resolving itself slowly as it approached the light of the lamp.

Eldest stood on the precipice of the light, his muscled frame cutting deep in shadow, yet his nakedness stood obvious as the reflected light bounced around his form. His intentions for her in this cave would only be to fuck or to fight.

I clicked the switch to activate my stick, filling the space with a thrum of power. Eldest stepped forward, not threatening exactly, but his solid erection made his intention clear.

His dark skin was alive in the glow of the cave, and a distant rumble of thunder broke in the background as he approached further.

I felt the first rush of warmth in my pussy as the implications of what could happen flashed through my brain My years of causality training were forgotten as the proximity of this wild, muscled and well endowed savage made my body respond in the only way it could. My heart beat faster, and I felt my skin flush. I felt my pussy flood in anticipation as Eldest stopped, just within reach. My stun stick could end this encounter in an instant. His eyes narrowed, and a burst of desire ignited within me. I dropped the stick. I took two steps back and reached for my top and pulled it, cross armed, up and over my head. My breasts bobbed free and naked, and I saw him widen his eyes in response. A thought in my head registered surprise at his reaction, every female he'd ever encountered would have been topless, yet the act of revelation still inspired lust in this ancient male.

He suddenly reached out and grabbed my wrist. I used a technique I had learned in self defence classes at the academy, and with a twirl of my arm I broke his grip and shoved his broad chest two handedly, sending him backwards a few steps.

I showed him my teeth and pulled my underwear down over my hips, letting them fall to the floor. He quickly stepped back into my space and this time grabbed me with both hands around my shoulders. His grip was weak and uncommitted, and I easily shrugged it off, again shoving him hard backwards. The look of confusion on his face turned angry, his brows joining in a V of aggression, a snarl curling his lip.

I felt the fear in that moment as a roil in my belly, and a surge of my heart. For the first time wondering if I'd bitten off more than I could chew, I scanned the floor for my stun stick. In the moments my eyes left his, he pounced again, this time like he meant it.

I stumbled backwards, my momentum only stopped by the cave wall, his weight pressing into me. I took in his scent, an earthy musk, he smelt sharp like the lull before the rain, and its tang stirred in me something primal. As we struggled against the wall, I let him get the upper hand, but it would have been a real fight to get him off now in any case. Our foreheads met in an aggressive push, and for the first time our eyes met intimately. I could see the thousands of years of evolution behind his copper coloured eyes, and they stared into me with undisguised intelligence and desire.

He twisted me around so I faced the wall and I felt the hardness of his cock push into my buttocks. His forearm pushes into my back held me still and his other handguidesnhis erection in clumsy attempts to find my entrance. I pushed my ass out as far as I could to provide a better angle, and instantly I felt my pussy stretch as he forced his dick into my eager hole.

I’d had little time for sex, getting into the Temporal Incursion Taskforce had been my life's purpose, so it wasn't a great sample size, but his cock filling me was the best feeling I had ever experienced. I pushed my ass back into him, greedy for his thrusts. He was frantic, and insistent. He breathed his rough sighs into my ear as I moaned my delight. My orgasm was welling up inside me but I felt his breathing change and I recognized what he too was building up to. No chance Fred Flintstone. I pushed off the wall and twisted my hips to force him out of me. He cried a series of anguished groans, confused and desperate. “ You'll cum Fred, but I'm not getting pregnant in this place, pal.” I had plan B in my main pack, you could never predict every eventuality that could occur, but who knew how long this hunting excursion would last.

Not understanding my words, he again lunged for me. I dropped my height and performed a judo throw to put him flat on his back. I spun on my hands dropping my weight on his chest, pinning his arms with my knees. In this position I wondered if I would be inventing cunnilingus if I slid forward and pushed my wet pussy over his mouth. I decided not, and manoeuvred the other way, much to Fred's delight. I reached down between my legs and found his erect cock and again impaled myself on it. It felt just as good riding him in this position, and almost immediately I felt the rush of blood to my erogenous zone, pushing my orgasm close to the surface once again. I fucked him fast and hard, in a race to bring my orgasm to fruition before his. My head rocked backward and I reached to my breasts to twist my nipples and heighten the feeling ripping through me. I cried my ecstasy into the dark, and it echoed back to me in a crescendo of passion. I looked back to his face through tears of pleasure, and saw his face screwed up in concentration. Nope, I told you once I thought and raised myself off him, intending to finish him with my hand. His eyes shot open in fury. I again felt the thrill of fear ripple in me, and again I felt it most in my pussy. He scrambled upward, powerfully throwing me off him. He sprung forward and pinned me to the floor. This fucking ape man was going to do whatever he wanted to my vulnerable body, and in that moment I fucking wanted him to. His hand pressed down in the space between my breasts, his other lifted my leg into the air, and he dropped his hips to once again penetrate me.

I grabbed the forearm that pinned my chest and tried weakly to move it, but quickly gave up and submitted to his will. His rampant thrusting into me flipped off my brain and thoughts were replaced by animal lust. He fucked me harder and I came magnificently, spasmodically bucking my hips as my pussy flooded with joy. He gave a primal roar and I felt the first jet of his cum tickle my inside, and soon a new flood of warmth lifted me to new levels of gratification. I stared up at his face, eyes wide with spent lust, breathing hard. His closed eyes opened and he looked down at me with a new expression in his features, and I felt what could only be described as love from his bright eyes and parted lips that made small unintelligible, soft grunts. The arm that pinned me was lifted to my face and he brushed my cheek, laying down next to me. He left one arm over my chest and closed his eyes once more, this time in a contented doze.

I lay still and let my body bask in the post orgasmic glow. I wondered what my actions here could have done. If this load, that slowly leaked from my used pussy, was meant to be inside some cave girl, I could have just extinguished an exponential line of descendants. My future could be decimated by this one creampie. I couldn't have been the first operative to fuck a subject. I let myself not worry about it.

Fred was snoring gently. Men I smiled.

I carefully extracted myself from his embrace, and dressed quietly. My underwear would go into a plastic specimen bag to be examined on my return. God knows how I'd explain my sample collection, but it was too good an opportunity to waste. As was this whole mating experience, I'd have to find a creative way to write this up in my notes, for sure.

I'd have to cut this observation excursion short and retrieve my kit and my Plan B, so after giving my sleeping partner a last glance, I crept from the cave and into the night, hoping that my actions had no further consequences than this one jilted lover.