Author's Note
As with my other story, this takes place before Twilight ascends to Princess-hood.
Chapter 1
Stifling a yawn, Twilight sat up in bed. The blanket fell away as she reached for the ceiling, greeting the first rays of sunlight as dawn began to crack upon the Golden Oak Library. Twilight groped clumsily at her bedside table, searching for her calendar and reminder of the days activities. Using her free hand she wiped the sleep from her eyes, raising the pad of paper into her view. With a raspy voice Twilight croaked her notes aloud to herself, "Sunday: Breakfast, lab prep in the bathroom, continue experimentation on new life form..." Thinking her routine through, she nodded in thought. Suddenly, the realization dawned that another day of untold discovery awaited her! The creature she stumbled upon awaited in containment in the bathroom. After ensuring it was benign, Twilight looked forward to a more exhaustive study. Sliding free of her covers, Twilight tugged at the sleeves of her pajamas and approached her wardrobe.
A reclusive day in experiment meant there was no need to be picky regarding clothing, and Twilight pondered her most appropriate garments for the morning. "These will only get in the way during the experiment... Breakfast will be in my pajamas then!" Smoothing her long sleeve pajama top and bottoms, she descended the stairs towards the kitchen. This mornings meal was postponed as she stood in front of her pantry, lost in thought. "Hmm... The subject subsists on the mucus and secretions of other creatures, so my diet could affect it... Better record my meals while I'm at it. Oh, and I'll need to intake lots of fluids!" A large glass of water and a serving of fruit later, Twilight scribbled away on a small notepad the details of breakfast.
Twilight departed the kitchen and headed for the bathroom, still clutching her trusty notebook and pen. Stepping inside she greeted the aquarium that now resided on the counter, ever since Twilight decided to house the creature. "Just like I left you, how are you this morning?" Inside the small aquarium sat an opaque teal orb, about the size of a fist. As if acknowledging the sound of Twilight's arrival, the orb bounced and rippled. "And to you too! I bet you're nice and thirsty aren't you?" Twilight shuffled to the sink, and slid open the lid of the aquarium. "Oh! I almost forgot." Twilight placed her pad and the pen on the counter, and her horn glowed a violet hue. The pen and pad levitated a few inches, and Twilight closed her eyes in focus for a moment. "There, that should do." The pad scratched away, transcribing each word spoken.
Ready to begin the experiments in earnest, Twilight took a deep breath and nodded to herself in the bathroom mirror. "As previously discovered, the creature gains nourishment from almost all liquids, gaining mass in the form of a gelatinous shell it can manipulate to move and interact with it's environment. When removed from the shell, the gelatin reverts to its previous form. The mass gained is based on the liquid the subject touches, and thus far bodily oils and fluids from ponies seem to stimulate it's growth most drastically. I'll allow it to move around using my saliva. It's not gross, it's science." The last sentence was used to steel her resolve in the name of discovery, and Twilight leaned closer to the rippling orb. Opening her mouth, a small string of saliva dripped onto the creature, and it bounced enthusiastically.
The spittle dissipated into the orb, and a thick sheen of water encased it, growing out a centimeter or so in every direction. The creature began to roll softly about the aquarium, it's new-found casing lurching to accommodate its movement. Twilight looked on with rapt interest, smiling at what she interpreted as joy. "Today I'll have you take on more mass than I have before!" she pat the orb to punctuate her sentence, the creature stopping to brush back against her palm. Clearing her throat, Twilight's cheeks turned subtly darker, and she looked to her pad of paper. "Today's experiment will consist of my supplying of the subject with a large amount of my bodily fluids. As I don't find it healthy to provide waste material, and I don't want to sit around for thirty minutes spitting on him, I've discovered a very simple way to provide plenty of material for the experiment." Twilight opened a nearby cabinet built into the sinks counter. She withdrew a thin phial filled with a thick purple mixture. "Zecora has provided me with a female copulative aid, guaranteed to..." Her cheeks deepened another shade as she spoke, "Ahem, increase sex drive, provide ample lubrication, and in most cases, encourage a wet finish among individuals capable of such a thing. With this, I don't think there will be any trouble getting the experiment underway in a few short minutes."
Twilight once more cleared her throat and uncorked the phial. "I'd like to state for posterity, that I have deemed this necessary, and would never do something like this recreationally.", she pleaded to her notebook and pen. The teal orb bounced a few inches into the air impatiently, awaiting more sustenance. Twilight held her nose and downed the mixture, giving a labored swallow to take in the thick potion. A few ragged breaths later, she patted the orb apologetically, "Ugh, sorry... That stuff's hard to get down, but I think we're finally ready to begin." She gripped the aquarium and carefully hefted it off of the counter, turning around to approach her bath tub. After setting it down at the tubs edge, she began to loosen her pajama top. "Alright little guy, just a minute or so longer..." Twilight hefted the shirt up over her head, pulling it free of her long hair, exposing her modest chest to the cool air. Discarding the top, she reflexively covered her breasts with one arm. "Heh... Even though you have no obvious means to see, I still find it a little bit embarrassing." Chuckling at her own foolishness, she uncovered her darker plum shaded nipples.
Once again the orb undulated with urgency, pressing against the side of the aquarium. Twilight licked her lips as the effects of Zecora's aphrodisiac began to take hold. "Oh my... This potion is very effective." Twilight ground her thighs together, already painfully aware of the dampness spilling from her sex and beginning to stain her pajamas. "Better get these off for you huh?", she cooed with half lidded eyes down at her subject. Wiggling her hips, she drew the thin garment down and let it drop to the floor. She placed one foot free of the pant legs, and kicked the garment across the bathroom to join her top. Biting her lip, Twilight pressed her hand between her slender thighs, rubbing the ball of her hand over her increasingly heated groin. "The potion took perhaps thirty seconds to take effect, or perhaps my anticipation of the experiment played some part?" She knelt down and grabbed the orb with both hands. The thin slimy membrane clung to Twilight's hands in a pseudo embrace as she drew it from its container. "Alright, into the tub to avoid a mess... I'm beginning the experiment!"
Gently into the tub the orb was placed, the drain quickly plugged as Twilight climbed in opposite the creature. As if lost the creature nodded back and forth, exploring its new enclosure. Twilight sat down into the tub and spread her legs subtly, sliding a hand between them to begin to massage her freshly engorged vulva. With her other hand she reached to guide the creature closer, cooing in pleasure as she did. "As a side note, the mixture appears to increase sensitivity, I'll have to mention this to Zecora as a positive side effect..." Twilight buried a finger into her burning slit and prodded along her inner walls. A loud moan escaped her lips as she curled her finger and drew it from her dripping honey pot, a thick strand of nectar clinging to the digit. "Mmm... Eat up little guy." She smeared her finger across it's surface, and the creature pressed into her finger eagerly. The membrane began to expand, oozing out to encompass Twilight's damp finger. "That tickles!", she laughed quietly as she freed her finger gently from the creatures gel.
"Keeping in mind that I can remove the creature from its gelatinous shell to stop any undesired activity, I'll now allow it to absorb a larger quantity than I have to date." With slight apprehension, Twilight extended her violet legs to either side of the creature. Twilight gave an anxious gulp, and took the creature in one hand. With the other, she spread the glistening lips of her pussy, a rivulet of her excitement streaming from her winking insides. "I have to wonder if I would allow a creature to do something like this without a powerful aphrodisiac... What am I saying, no turning back now!" In a show of devotion to science, and definitely not a lust fueled craving, Twilight urged the creature closer to her wanting crotch.
Twilight gasped quietly at first contact, the orb being pressed gently into her spread labia. The gel encasing the creature once again grew in size, taking in each bit of liquid pleasure Twilight leaked forth. Her hand sank into the mixture as in a matter of seconds the gel expanded outward to a depth capable of swallowing her hand. The creatures gel pressed onward towards its nourishment, flowing slowly into Twilight's depths. Her head sank back to rest on the tubs edge as she closed her eyes in ecstasy. The ever growing sphere pressed into Twilight's thighs, embracing her curves softly in a clear pudding. She began to moan as her inner walls spread, and the pool of gelatin began to pulsate and massage her insides, coaxing more fluid from Twilight.
A feeling of fullness graced Twilight as the creature bottomed out, pressing softly against what she assumed was the passage into her cervix. The creature filled her with the product of its growth, but she found the pressure pleasurable instead of uncomfortable. Twilight writhed in pleasure, gripping the edge of the tub with her free hand. She pressed her heels into the tub, bucking her hips blindly upwards against the creature, which simply clung to her as it had. "O-oooh... He's reacting very well, and is growing mmm... Very quickly." A particularly powerful tremor shook the creature as stepped up its ministrations, and Twilight's voice caught in her throat, voicing a series of high pitched squeaks. The mass of gel thrashed back and forth against Twilight, drawing its mass in and out. Twilight's body shook with each wet slap of the gel on her crotch and thighs, as an orgasm came crashing down onto her.
Gritting her teeth, she arched her back and thrust her rear as far into the air as her legs would allow. She felt the gelatinous mass surge from her as her orgasmic contractions forced it partway out. Twilight let forth a stream of pleasure, squirting into the creature encompassing her lower body. In response, the creature grew explosively, and Twilight's vagina stretched painfully to hold the newfound mass. The height of her orgasm clouded the pain, and she lost herself in the intense feeling for many seconds of rapid growth. Twilight collapsed onto what was now functionally a beanbag chair, and the creatures massive form continued to press into her pussy, massaging her to new heights of pleasure.
Falling into a comfortable rhythm, Twilight lay gyrating her hips in the tub, as wave after wave of pleasure washed over her. Twilight withdrew her hands to her chest and began to massage and pinch her nipples, quickly approaching another titanic orgasm. Gasping breathlessly, Twilight clenched her nipples in each hand and curled her toes as she once more released a stream of ejaculate into the gel. Her muscles clenched and strained once more, and a soreness began to build in Twilight. "Alright little guy... It's time to ooh-!... Put the experiment on pause!" Her horn once more glowed, and the core submerged deep in the large clear mass shone. Twilight levitated the teal core free from the mass of gel, and the gel sloshed down into the tub, becoming a formless pool of liquid. Setting the core gently into the aquarium, Twilight released her magic and breathed a sigh of relief. "The subject grew at an alarming rate... And boy did that take a lot out of me."
Twilight hissed through her teeth as the pleasure died down and she became aware of her cramping muscles, and overly stretched insides. "Ooh, I'm going to feel this for a few days." Very slowly she brought her feet close, sloshing gently in what was essentially her own orgasmic fluid, and prepared to stand. As she raised her rear from the porcelain tub, a heavy stream of liquid rushed from her crotch, and she sighed at once more feeling empty. She bent forward and spread her legs, looking down at her well worn sex. "Oh my...", the wide gape of her vaginal cavity stared back at her, and she rubbed her tender labia. "I AM going to feel this for a few days, aren't I?"