Chapter Text
The sterile hum of Ruan Mei’s lab was as unwelcoming as ever. And a tense reminder of the outcome of their last encounter. The time Herta was strapped to a chair and mercilessly edged by Ruan Mei’s clinical grasp, only to fill a glass beaker with her copious release. That night had revealed everything. Ruan Mei’s fascination with the volume of her seed. The crimson flush on her cheeks. The way her eyes lingered obsessively on the results, so awed by the potential that even her meticulous pen failed to record the outcome. The biologist’s experiment was only a veil for her true desire to be impregnated. Kink wrapped in clinical detachment. And when Herta whispered her discovery in Ruan Mei’s ears, the reaction only served to replicate the results.
Terse, awkward messages followed, trading blows as each sought their preferred method for the next experiment. Ruan Mei wanted to pursue her obsession with propagation, and Herta was the ideal genetic match. Herta refused to be reduced to a sperm donor again, demanding something more real. More intimate. No drugs or artificial aids as a barrier to their raw biology. When Ruan Mei had finally relented, it was only because timing had won what words could not.
“I will be fertile tomorrow,” Ruan Mei’s message read, as clinical as it was unintentionally lurid. “We shall attempt your method then.”
When Herta stepped into the lab, she was immediately assailed by the familiar scent of plum incense and bitter antiseptic. And by the sight of Ruan Mei at her desk, realisation of what was about to unfold forcing a rush of blood to Herta’s head. The biologist looked up, her azure eyes unyielding, though the faint flush, and the way her fingers tightened on the edge of the desk, betrayed the limits of her composure.
“You’re punctual,” Ruan Mei said, rising from her chair. “I have already optimised the relevant variables to maximise the chance of successful fertilisation during this ovulation window. Shall we begin?”
Herta smirked, leaning back against a console. “No hello? No thanks for coming? Right into the science? You know, if you want me to knock you up that bad, you could at least pretend it’s not a lab procedure.”
Ruan Mei’s lips twitched, barely a hint of frustration gone in an instant. “Irrelevant. This is an experiment in propagation. Your role is to provide seminal fluid via copulation.”
“Oh, I understand,” Herta smirked. “I am just surprised by your impatience. Can’t hold back the excitement of your first time, perhaps?”
Ruan Mei ignored the jab, turning to the desk and propping herself over it. She adjusted her coat meticulously, dragged up and draped over one side, revealing only the bare minimum. Her pussy. Framed by pale thighs. No more exposure than necessary for the experiment. Yet glistening with reluctant arousal that trickled down the inside of her thighs, betraying the depths of Ruan Mei’s arousal. The notes, the detachment, the pretext... How long would it be until Ruan Mei admitted this was all a peculiar form of foreplay to her, Herta wondered.
Positioned herself behind, Herta’s thumb dragged her skirt and panties down to free her hardening length with a casual flick. She gripped it, tip poised close enough that she could feel the inviting heat radiating from Ruan Mei’s core. The hum of the lab seemed louder for the silence that hung between them as Herta awaited Ruan Mei’s instruction.
“You may...” Ruan Mei paused, neck tilting away to hide her deepening blush “Begin the process of insemination.”
Two gasps rang out as Herta pushed forward, the head of her cock pressing against but not breaching Ruan Mei’s core. Herta’s was voiced freely, enticingly. Ruan Mei stifled hers in the crook of an elbow as she made a futile attempt to turn her attention to the notebook sprawled on the desk beneath her. Slick, drenched lips massaged their syrupy heat around the head of Herta’s length as she nudged her hips forward, slowly rolling her body in a teasing grind. Part of her wondered just how far she’d need to push Ruan Mei before she’d drop the act and permit this experiment of hers to play out its natural course. But another more primal part of her wanted to push inside. To claim. To fill.
“Inside, Herta,” Ruan Mei commanded. “Or did I not explain the required procedure in sufficient detail?”
As she pushed forward, Herta was beside herself at how easily she found herself obeying Ruan Mei’s whim, that voice a strange allure, her body a buried promise. She sank between Ruan Mei’s folds with surprising ease, guided by the wet embrace. Herta’s ego had anticipated that Ruan Mei’s struggle to take all of her for the first time would elicit some reaction, so the disappointment had her mind briefly drift for an explanation. Perhaps those meticulous measurements recorded in their last encounter had been put to use for training. Ruan Mei was doubtless the type to insist on practice with a perfect, artificial replica. Thoughts that soon scattered as pleasure completely engulfed her. Velvet vice clamped down with a scorching heat that enveloped every inch. Wet, clenching walls rippled greedily, drawing Herta deeper until she was hilted, her hips flush against Ruan Mei’s ass.
Physically, it was perfection. Tight. Drenched. Alive with subtle pulses. But emotionally? Hollow. Ruan Mei seemed to barely acknowledge her presence, her posture rigid. No arch of her back. No moan. Just clinical endurance, the only sound the steady scratch of her note-taking.
Herta started slowly with cautious, methodical thrusts, testing for a response, seeking the point where Ruan Mei’s restraint would crack under the pressure of biological impulse. Almost nothing. Sure, there were her deepening breaths, and the elevated heart rate. Subtle signs that Herta could measure easily enough. But these were mere data points to Ruan Mei, jotted down with unflinching position as she emotionally took Herta’s cock to the hilt with every meeting of their hips. But surely, that detachment was what Ruan Mei was after? Was part of her kink?
“Oh, come on,” Herta murmured, leaning in closer as she quickened her pace, “Admit it. This whole act, the notes, the commands. It’s what gets you off, right? Science as your safe word, hiding how badly you want to be filled.” She punctuated with a deeper slam, feeling the walls around her cock flutter in betrayal.
Ruan Mei’s pen faltered for a split second, but then resumed. “Focus on the experiment, Herta. Your commentary is extraneous.”
For all Herta’s hopes, in truth, their first time together may as well have been masturbation. The initial thrill of breaching through the researcher’s icy exterior soon came stuck against the realisation that there were yet more layers to pry open. Quickening, instinctive thrusts, driven more by her own search for pleasure than any method, yielded no further fracture of Ruan Mei’s restraint. The detachment grated. This wasn't lovemaking. It wasn't even fucking. It was mechanical, masturbatory insemination, Herta reduced to a mere tool in Ruan Mei's grand design. And what a weak, vulnerable tool she really was, already driven to helplessly, instinctively bucking her hips into Ruan Mei’s ass, every thrust sending a firm slap echoing off the sterile walls, as she approached her climax.
It was only then, as Herta neared her peak, that she finally got the reaction she so craved from her partner. The slightest crack of resolve bloomed into a low, delicate rasp, barely audible as Ruan Mei buried her face in her notebook. Not pleasure, Herta suspected. More anticipation of Herta’s impending climax, and the conclusion of the experiment. It was a release that Ruan Mei would not share. No reason to ask why. Herta already anticipated the explanation. Her climax was necessary for reproduction, Ruan Mei’s was not.
Bearing down with one final motion, hands tightened, hips firm, cock planted and tip against Ruan Mei’s fertile womb, Herta flooded her. Spurt after thick, copious spurt, her release surged with intensity built from weeks of tension, all efforts to observe Ruan Mei’s reaction drowned out in that split second of white, roaring bliss. Eyes clamped shut, muscles straining, groans leaking from her lips. And when it ended, emptiness followed. Washing over her like the cold lab air against her slick cock as she withdrew from Ruan Mei’s warmth, excess sperm already leaking in thick globs from her entrance.
What else could she have expected from this near-masturbation? What else could two geniuses yield when they were too stubborn to admit their desires?
Ruan Mei straightened moments later, adjusting her coat with a precision that left no evidence of what had taken place between them. “Procedure concluded. You may leave.”
Herta pulled her skirt up, trying to put on a smirk through her dissatisfaction. “Same time next month, then?”
Ruan Mei said nothing, already analysing preliminary results.
Back at her station, Herta’s days blurred into routine as she tinkered with the Simulated Universe, her mind inevitably wandering to that encounter, as enthralling as it was hollow. But the results soon came through in a single message.
“Negative.”
“Maybe try enjoying yourself next time? Might help the little swimmers find their way,” Herta replied, but any further elaboration was stalled by Ruan Mei blocking her once again.