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Unable to stop the curious young human, Yumemi simply submitted the small morsel of pleasure, allowing Kosuzu to pass her cock back and forth between her hands, eagerly exploring its entire length as she squeezed and massaged her throbbing mass of flesh. Each gently movement of her supple hand coaxed more and more pre-cum from her already glossy tip. At first, Kosuzu found the slick substance to be less than welcome, but as more of it began to cover her hand, slickening the steady movements of her fingers along the scientist’s cock, she began to welcome each pearly bead as it rolled down her purplish tip and coated her fingers. After her initial exploration and inspection, Kosuzu began to notice the soft moans escaping from Yumemi’s lips, noting the way her breathing grew ragged as she pulled the girl’s foreskin back, gently stroking her shaft. Turning herself away from an eager exploration of a new thing, Kosuzu began to chase those moans, wanting nothing more than to help her scientist friend experience new pleasures. Being inexperienced herself in stuff like this, Kosuzu fumbled around a little as she tried to figure out the right way to move her hand and the best angle to stroke the girl’s cock.
Doing whatever seemed to make Yumemi moan the loudest, Kosuzu quickly managed to pick up the right technique, pumping her hand back and forth along the girl’s cock, steadily jerking her off, watching the professor’s face contort in pleasurable disbelief as more and more pre-cum poured from her quivering twitching cock-head. It was quite a satisfying thing to bring such pleasure to the girl’s body, with Kosuzu savouring each moan that she was rewarded with. It brought a little bit of joy to her body, not the mention the light quiver that shuddered through her own rapidly aroused crotch.
“We… we should… oh… oh my that is…” Yumemi moaned, unable to bring about a conscious and coherent thought. She was about to stop Kosuzu and continue with the designated purpose of the experiment, but before she could finish her sentence the human girl slid down onto her knees in front of her, changing the angle of her hand and breaking into an even steadier and more pleasurable handjob. Kosuzu had no intention of taking the professor’s cock into her mouth, yet to Yumemi it seemed like the girl was on the mere verge of leaning forwards and capturing her engorged cock-head with her lips, taking her shaft deep into her sumptuous throat. Yumemi’s thoughts were running wildly as she stared down at the innocent smile on Kosuzu’s face. That innocent smile, framed parallel to her thick cock, corrupting the sweet and naïve look of the girl. Naïve was hardly a good descriptor Yumemi thought, given Kosuzu’s eagerness to jerk her off and the previous revelation of Kosuzu’s rather experienced real of personal pleasure, yet in that moment Yumemi reduced Kosuzu down to pure visuals. And the round sweet features of supple face, paired with the thickness of her cock being pumped mere inches away from the human’s face, was more than enough to make Yumemi’s perverted thoughts flare up. Her moans continued as she waited with bated breath for Kosuzu to lean forwards take her cock into her mouth, yet she didn’t seem to want to.
She was taunting the professor, holding her lips so tantalising close, lingering so very near yet never committing to what would be the ultimate satisfying pleasure. Yumemi debated grabbing the girl’s head and thrusting her hips forwards, but quickly defused such thoughts, trying in vain to maintain an objective scientific mindset. Wanting to slam her cock balls-deep in the girl’s clutching throat was hardly the object of the experiment. But there was nothing she wanted more. As her eyes rolled closed, she imagined Kosuzu’s lips pressed firmly against her shaven crotch, the girl’s throat bulging with her cock as she coughed and spluttered, her innocent inexperience rendering her unable to deepthroat, yet she was so intent on pleasuring the professor that she was willing to let her throat spasm and quiver if it meant bringing pleasure to the scientist’s body. Anything to make the gorgeous scientist cum.
Those thoughts corrupted Yumemi, reducing her to base and desire driven creature. Brushing the girl’s auburn hair out of her eyes, Yumemi lightly clasped the back of her head, biting her lip as Kosuzu continued to draw her hand back and forth, continuing to jerk her off with intense desire. Leaning slightly forwards, Yumemi brought her hips closer to Kosuzu’s oblivious lips. The human girl smiled sweetly, assuming that Yumemi was simply adjusting her position to be more comfortable. However, this was far from the case. Still staring up at Yumemi, the human girl asked politely, “Does that feel good pro…”
Before she could finish her sentence, Yumemi thrust suddenly and sharply forwards, pushing the head of her cock into Kosuzu’s mouth unexpectantly. Spluttering instantly, Kosuzu pulled sharply backwards, giving Yumemi only a moment within the pleasurable confines of Kosuzu’s sumptuous mouth. Dropping Yumemi’s cock from her hand, Kosuzu fumbled backwards, slipping off her knees and onto her back as she tasted the copious amounts of pre-cum that had splashed onto her tongue. Instinctually, she spat it out, not used to the taste and the suddenness of the intruder. Snapping back into reality, Yumemi felt her cock flop against her thigh. Whilst she was rock-hard, her cock remained heavy enough to swing downwards slightly. Reaching out to Kosuzu, she began to apologies profusely as the human girl brushed her hand to one side and helped herself up. Wiping her mouth, she glared somewhat at Yumemi before noting the professor’s sincerity in her apology, “I’m really sorry, I don’t know what came over me. I must have slipped forwards.”
“It’s quite alright. The taste simply… caught me off-guard. Perhaps it was my fault for being so intently occupied on my inspection of your penis. I apologise if I have distracted you from your original intentions,” Kosuzu smiled, wiping her mouth one last time and clasping her hands in front of her, “Shall we proceed with the experiment?”
“Erm… Yes… Of course. Make yourself comfortable and we’ll begin,” Yumemi smiled, glancing around for the recorder that had slipped from her hand as she lost herself amidst the pleasurable haze of Kosuzu’s handjob. Catching her breath and clearing her thoughts, she turned back towards Kosuzu and gulped. The human girl had reclined on the bed getting herself comfortable as Yumemi had asked, only she was laid on her back, spreading her legs nice and wide. In hindsight, Yumemi shouldn’t have been surprised by this, given that missionary was easily the most popular and common of positions; at least in Gensokyo. But seeing the girl spread out like this was truly surprising. In the weeks leading up to the experiment, every single vision she had for the actual conception process had been of singular design. Yumemi envisioned all three subjects bent over their beds on all fours. She had expected to go from test room to test room without any form of interaction beyond sinking herself inside the subject, doing her thing and leaving. She had ignored the personal element.
She could hardly tell her subject to make herself comfortable in the specific way that she wanted as that was completely and utterly counter to the intention of getting comfortable. It seemed in that moment that Yumemi’s idea of a pump ‘n’ go process had gone out the window. She was going to get into a little bit of a more intimate position. So many wild thoughts claimed Yumemi’s mind as she looked at the human, spreading her legs and flaunting the tight slickness of her wet pussy. And she was incredibly wet to say the least. It seemed that the girl’s experimental handjob had done more than just satiate Yumemi’ carnal desires but also worked to arouse her. She was positively gleaming down below. That fortunately meant that Yumemi didn’t have to do anything in addition to make her so. There was no need for her to reciprocate. With a nervous stammer, Yumemi asked, “Are… Are you comfortable?”
“Oh, yes. Very much so,” Kosuzu replied with a smile, adjusting the pillow beneath her head before waiting patiently for Yumemi. Reaffirming her scientific zeal, Yumemi made her way over to the bed, clambering on top and kneeling between Kosuzu’s legs. Unflinching, she placed the recorder to one side and crawled atop Kosuzu, her face lingering above the human girl as their stomachs lightly touched. Reaching down with one hand, Yumemi grasped the base of her cock and angled herself towards the sumptuously slick folds of the human girl. Shifting her hips forwards, she nestled the engorged head against the nest of slick folds that was her pussy, searching for the right angle. Before she pushed forwards, Yumemi had her confidence shook by Kosuzu one last time, “Go slow, please. I am quite tight.”
Tight. It’s amazing how one single word could send shivers through Yumemi’s hardened cock. How one word could shatter the brief scientific mindset that had adopted and reduce her back to a nervous shell, governed by a conflicting desire to satiate her sexual desires whilst wrestling with the need to stay objective for her scientific purposes. Nodding, Yumemi didn’t dare open her mouth out of fear of what stammering nonsense she would splutter out. Instead, she simply bit the bullet, sinking her hips downwards and pushing the head of her cock into place. Able to find the girl’s entrance with relative ease, Yumemi was utterly surprised by the fact that she was immensely tight. It took a little work and a little creative teasing to eventually get the proper angle and access. With everything in place, she wasted no time at all In easing herself forwards. The head of her cock pushed inside of Kosuzu with ease, the girl’s pussy seemingly engulfing it as soon as she was properly warmed up. The tight warmth of her heavenly entrance drew her cock-head inwards, bathing and basking the sensitive bulb of flesh in the slickness of her pussy. Moans escaped both of their lips as the pleasure took them, their hot breath intermingling with one another, their lips so dangerously close to one another. Letting go of her cock, Yumemi was confidant that her cock would remain in place. Instead, she devoted her hands to maintaining a degree of distance between their lips, worried than in a sexual driven haze she would assault the human with a barrage of intense embraces. Even as she did distance herself, she was silently hoping that Kosuzu would deny such a movement and force and embrace herself. Instead, the human simply reclined, enjoying the familiar pleasure of being penetrated, but savouring the new sensations of having a real cock inside of her, her mind swirling with pleasurable satisfaction.
All that she had thrust inside was a single inch, and the two of them were already swimming in satisfaction. Yet, as Yumemi pushed forwards, steadily sinking herself inside of Kosuzu, inch by inch, she began to feel Kosuzu’s pussy tightening, her insides clutching around her cock more and more. Perhaps it was because Yumemi’s cock swelled in thickness towards the middle, or maybe she was plunging into untouched depths of Kosuzu’s semi-experienced cunt, but the professor steadied her pushes and began to allow the girl moments to adjust to the thick impending intruder. Frankly, Yumemi was happy to simply let her cock linger in the tight haven that was Kosuzu’s pussy. The way her insides quivered and clenched around her cock, tightening and loosening as the human grew more accustomed the cock, all of it was simply sublime. With around half of her cock easily inside of her, Yumemi pushed a little further forward, accidently slipping two more inches suddenly and unexpectantly inside of her. Yelping, Kosuzu’a hands leapt upwards and clasped around Yumemi’s neck, pulling her lips closer, their breath once again mingling as Kosuzu attempted to grow used to the thickness now swelling within her exceptionally tight entrance. She didn’t let go, keeping Yumemi’s head pinned in place as she steadily began to moan again, her legs hooking around the professor’s waist as if to imply she wanted her to continue. After the sharp suddenness of that unexpected push, the remainder of Yumemi’s cock easily slipped inside, her crotch pressing against the wiry auburn patch of Kosuzu’s unshaven crotch, her heavy cum-laden balls smacking softly against the human’s rounded bubble butt, the two of them locked together, crotch to crotch; cock to pussy.
Giving Kosuzu a moment to adjust, Yumemi watched her face intently, loving even the slightest quiver across the auburn-haired girl’s lips, the subtlest excretion of pleasure shuddering across her face. It was almost as entrancing as the pleasure itself, her body relishing the tight clutching nature of her pussy, the clutching nature that drew her deeper and deeper, just as the delicate moans of the human brought her steadily closer to simply throwing caution to the wind, abandoning her scientific principles ands simply devolving to pure erotic desire. She was strong enough, however, to ignore the initial allure, instead beginning to pull her hips backwards, drawing her cock back through the heavenly embrace that was Kosuzu’s pussy, the legs that were wrapped around her waist relaxing to allow the steady draw of her cock to grind against every sensitive avenue of her delicious pussy. Moaning in unison, the two of them shifted their bodies apart, allowing Yumemi to pull her hips back until only the head of her cock remained. Plunging back inside, Yumemi was thrilled to feel Kosuzu’s cunt give away almost instantly, welcoming her cock back with complete ease, the obtrusive tightness that she previously displayed given away to welcoming embrace. She was still tight. But no longer did Yumemi have to wrestle her way inside. Now she could focus on fucking the human, sliding her cock intensely into her pussy, lovingly… no, not lovingly. Simply fucking her.
The intense position, the intimate haze of their mingling breath, the orgasmic moans seeping from Kosuzu’s mouth, the tight embrace of her welcoming pussy, all of which was compounded by the tight clasp formed by the human’s legs around her waist; all of it screamed intimate, romanticism. Yet, those emotions didn’t form in Yumemi. Instead, desire and passion. Her thoughts were wild, spinning and losing themselves amongst her pleasure-ridden brain. Finally, she succumbed to it all. To the pleasure. To the bliss. All scientific thoughts shed themselves from her and she simply lunged into a flurry of intense and powerful thrusts, desperate to unite their bodies in heavenly orgasm. No longer did Yumemi care for the results of the experiment. Frankly, they were a happy coincidence for her. No, it was her desire to cum inside of Kosuzu that drove her to fuck her with such intensity. Desire to simply cum, not to study the fruits that came a result.
In that moment, Kosuzu would have been hard pressed to disagree. Her mind was submerged in new realms of pleasure. Each thrust of Yumemi’s cock, drove more pleasure into her body, shooting shuddering waves of new sensations through her insides. The contrast of being suddenly filled and emptied of such a thick and powerful cock was beyond description. Clinging to Yumemi’s neck, Kosuzu continued to use her legs to make sure that Yumemi sank every single inch inside of her, the human wanting to feel each thrust as their bodies writhed together. The wet slapping of flesh became the chorus that inched them closer to their end. Kosuzu thought herself to have quite a lot of stamina, with her secluded sexual delights within her own bedroom lasting hours on end; however, she quickly found those to be false aspirations when faced with a real cock. There was something about the impact of each thrust, the shifting, throbbing nature of Yumemi’s cock. All of it was more pleasurable that her toys. All of it more enjoyable. Perhaps it was sharing the pleasure with someone else. Or perhaps it was the new extents to which she was being pushed with Yumemi’s size and power. All Kosuzu knew was that she was more than thrilled to have accepted being a part of this experiment. The pleasure and impending orgasm were already award enough. Her moans turned to light squeals as a grin stretched across her face. Yes, she would definitely enjoy this.
umemi kept her eyes open, watching the constantly shifting expression of Kosuzu’s lips. She would later speak into her voice recorder about how this was to access the subject’s mood and expression of enjoyment, but this was false. There was nothing more satisfying to Yumemi than the pleasure someone else derived from her cock. Seeing Kosuzu moan and grunt and groan in such tantalisingly suggestive ways gave her cock more pleasure than the infinite tightness in which it was consumed. The symphony of wet slaps, moans, grunts and squeals -combined with the distant sound of rhythmic slapping sounds from the adjacent room- brought both Yumemi and Kosuzu closer to orgasm. Strangely enough, Yumemi held back, making sure that she didn’t cum to early, wanting to make sure that Kosuzu was the one the cum first. Despite being completely irrelevant to the study, such thoughts didn’t even cross Yumemi’s mind as she made a conscientious attempt to ensure that pleasure found its way writhing through Kosuzu’s body before it did hers.
Each plunge of her cock threatened to take her closer to spilling rope deep inside of Kosuzu, yet Yumemi held on, gritting her teeth for a while as he body began to gleam with sweat. Fortunately for Yumemi, it didn’t take long for Kosuzu’s pseudo-virgin pussy to bring the human girl to a tumultuous orgasm, one that would forever remain with Yumemi in the moments of sexual arousal late at night. Nothing was more fantastic than the sounds of ecstasy that escape the young human’s lips.
A sudden and sharp squeal of delight erupted out of the human girl’s mouth as she arched her back, chasing the thick cock that was plunging in and out of herself. She wanted her to be buried deep inside her as she came, and Yumemi was more than happy to provide such a feeling. Hammering home once more, she too unleashed a sound orgasmic delight, driving her cock deep inside of Kosuzu, spilling her seed inside of the human woman. Several long strands of cum sprayed inside of her, the scientist’s pent-up orgasm finally bursting free and filling her to the brim. The two of them moaned in unison, the feeling of the other cumming alongside them driving them to spiral deeper into strand avenues of sexual delight. The feeling of cum bursting into her and painting her fertile insides was beyond description, causing Kosuzu to sweep into a new bout of moans and sounds of pleasure. Meanwhile the clamping pleasure of Kosuzu’s orgasming pussy tightening around her cock, clutching and pulling her deeper made for a sensational haven to lodge herself inside.
Moaning loudly, she savoured every last moment, drinking in the pleasure of her tightness, right up until her cock began to soften inside of her, eventually slipping out as the two of them fell away, breathlessly exhausted after their orgasmic bout of fun. Rolling away, Yumemi staggered slightly as she landed on her feet. Reaching back, she grabbed her recorder and made her way towards the door, only to get stopped by Kosuzu, “Is that it then? Can I clean myself up?”
“I would wait five minutes or so. Just to make sure. I’ll be back after I’ve seen to the other two to check you out… check up on you!” Yumemi explained, correcting herself at the end as she stepped outside of the test-chamber and closed the heavy metal door behind her. Turning back, she felt somewhat bad just leaving the girl there, but given how she had succumbed to her desires and had lost her scientific objectivity, she felt it somewhat important to distance herself at that point.
“Professor!” Kosuzu called out, moving to stand up, but stopping herself at the last moment when she realised that the cum inside of her would begin to leak out if she did. Smiling softly, she said, “Thank you for being gentle with me. I really enjoyed it.”
“Erm… Yeah… Yeah, me too…” Yumemi blushed, quickly turning and ducking away. Her plan had been to immediately move onto the next subject, but she disappeared back towards the stairs, heading upstairs to shower and calm herself down before continuing. Not to mention spending a great deal of time reminding herself of the purpose and design of the experiment. She wasn’t here to enjoy herself, but to make steps forwards in scientific knowledge. She hadn’t gathered three different species of females just to find out which one was the best shag.