Sweetie wasn’t having a good day. 

It started well enough, crusading with her friends, running around looking for fun things to do. That is, until Apple Bloom had the idea of going over to Zecora for a potion brewing Cutie Mark. Not that venturing into Everfree worried the careless young unicorn or anything, she had done it more times than she could count. The hiking was going to well enough, until her earth pony friend decided to take a shortcut. Sure, it might have been a faster path, but Sweetie wasn’t familiar with that part of the woods and the thicker vegetation certainly didn’t help the filly orientate herself. It was only a matter of time until she started falling behind and just when she about to ask her friends to slow down, an unseen vine hiding in the tall grass wrapped itself around her hoof and sent her straight to the ground. When she got up, she was all alone.

Sweetie walked around as she called for her friend, but her fellow Crusaders were nowhere to be seen. Eventually, she found her way towards a more open path, but she still had no idea where she was. In that moment, as if things weren’t already bad enough, she felt a drop of water hitting her snout. Looking up, way above the canopy, Sweetie saw the sky covered in dark clouds, heavy and rumbling with thunders. The random drops of water soon became a light drizzle, the drizzle turned into rain and it was only getting stronger by the second. Sweetie was scared, alone, lost and now in the middle of a storm. Now getting desperate, Sweetie ran, looking for shelter from the rain as her coat and mane kept getting wetter as the water splashed all over her. Surprisingly enough, it barely took her a couple minutes to find a cave. A big, spacious cave. Too cold to consider what kind of creatures could make their home there, Sweetie walked inside.

Sure enough, the cave was still cold and the ground was damp underneath her hooves, but it was better than being outside in the rain. Sweetie hesitated for a second as she stared into the darkness ahead, but a sudden gust of gelid wind accompanied by a splash of rainwater were enough for the filly to throw her hesitation out off the window and rush ahead. As the cave got darker and darker, it also became surprisingly more pleasant. Sure, it was still a bit chilly, but not as cold as outside or at the entrance. The sound of rain had since became a faint, far-off static, most of what she could now hear was the constant dripping of water coming from cracks on the cave’s ceiling. Still scared and near blind in the middle of the darkness, Sweetie decided to keep moving onward, one step at a time. She got so focused trying to see ahead of her, she completely missed the creature creeping behind her.

“Aw, what a cute filly! What are you doing here all by yourself, dear? ~”

Sweetie squeaked in surprise as her heart almost jumped in her throat. Fearing for her life, the filly turned around expecting maybe some kind of monster ready to gobble her up. She was very much relieved, even if very confused as what she saw looked like a normal mare. Light green coat, dark green mane, patient emerald eyes, a nurturing smile. Yet, despite her seemingly innocuous appearance, something about her seemed off in the darkness. Was it all the green? Her big sister never liked the color much. After realizing she spent more than just a moment staring at her, Sweetie finally answered.

“I-I got lost and wandered here. Do you, uh, live here? Sorry for intruding...”

Sweetie said, still a bit hesitant, unsure if she should trust a pony she had randomly found inside a cave in the Everfree Forest. The green mare giggled in response.

“Oh, it’s quite alright. That’s what caves are for, providing shelter from the rain. What’s your name, little one? I’m Motherly Slime”

Motherly Slime. That was a weird name. Why Slime? Sweetie knew she shouldn't give her name to strangers, but she had already said hers, so she wasn’t really a stranger. Besides, she could help her get home!

“S-Sweetie Belle!”

“Hm, a sweet name for a sweet filly. Don’t you worry none, my little dear, you’re safe now. Nothing will hurt you in here. But look at you poor little thing, so wet. Aren’t you cold?”

“I-I guess. At least it’s warmer in h-”

“Oh no, that won’t do! Momma will keep you warm ~”

Before Sweetie had the time to even register what Motherly had said, she moved closer. Much closer. Uncomfortably close even as she suddenly wrapped her arms around her in a tight hug. It was in that moment that whatever Sweetie felt was wrong with the older pony became clear. She was see-through. She didn’t even feel like a pony, she was still warm, but her body was formed by a slick, jelly-like substance that deformed itself around the filly’s shape as she was hugged. And yet, despite her amorphous body, she had a surprisingly strong grip. Her name made more sense now, yet Sweetie was more scared than ever.

The already scared filly then got paralyzed in fear as her body started sinking inside the green pony. She tried pulling back, but the goo stuck to her hooves and pushed her back in Besides, it’s not like could go move too far while trapped in Motherly’s hug. Finally realizing she was fighting a losing battle, Sweetie took a deep breath as she was fully submerged, the goo pony’s body fluidly changing shape to accommodate the filly inside, leaving her floating right in the middle of her belly. The inside of her body felt much like lukewarm water, just denser, which did no favors to the filly who flailed around in place, trying to swim or even just reach out off her. Already tired from all the struggling, Sweetie resigned to curl herself in fear as she was trapped in the mare’s watery body and wait for her impending doom. When her breath finally run out and she breathed again ready to drown, Sweetie was very much surprised to discover she could breathe just fine. For a while Sweetie just stood there, floating in place in the warm substance, wondering what would happen next. It didn’t take long for her to find out.

Just as the filly was starting to relax and get comfortable, she was taken by surprise as a long tendril suddenly formed itself from Motherly Slime’s innards and forced itself inside her mouth. The scared filly almost felt sick for a second before realizing that, surprisingly, the gooey tentacle moving down her throat didn’t trigger her gag reflex. Before she had the time to ponder the purpose of the invasion, another one penetrated the filly’s slick, moisty pussy, earning a muffled squeak from her as the shape moving inside her triggered a tingly, pleasant feeling inside her crotch. As the tentacle continued pressing in deeper than Sweetie could properly understand, its erratic movements only intensified the mysterious feeling inside the unicorn filly, sending occasional sharp bolts of pleasure down her spine as she moaned softly, sucking on the soft substance in her mouth. At that pace it didn’t take long for Sweetie to momentarily forget about her fear as she reached her very first orgasm, her young body sent into a convulsing fit as the filly felt more pleasure than ever before as her sensitive pussy released some of its fluids in the already submerged space around it, which were promptly absorbed by the goo pony’s body. As the squeaky filly was basking in the heaven of her orgasm, the Slime took the chance to form a third tendril around Sweetie’s puckered asshole, poking against it for a second or two before breaking in. Of course, the young filly was too out of it to even react, but she did still moan even harder as the tentacle went deep inside her, filling her to the brim as it pressed her inner walls and stimulated her prostate, giving Sweetie an even more pleasant experience.

The tentacles continued working their magic, slowly pulsating as they rhythmically went back and forth inside her, earning harmonious moans of pleasure from Sweetie as she filtered out all the worries and dread from before, focusing solely on the pleasure she was feeling. At that point, she didn’t even notice when a fourth and final tentacle materialized and inserted itself inside her belly button, fully connecting the now mother and daughter and just like that, she went to sleep as the goo pony lovingly caressed her belly, like a pregnant mother.

Sweetie eventually woke up. She wasn’t sure for how long she slept, but she didn’t really care. The tentacles thrusted, not treating the filly too roughly yet never stopping giving her the so sweet pleasure as she sucked softly on the warm goo filling her mouth. She could feel the Motherly Slime’s presence and love, but funny enough, she couldn’t really see what she was doing, as even with her eyes open, she somehow couldn’t properly process what was beyond the green substance she was inside of, as if that was her entire world. But once again, with how good she felt, that didn’t really bother her and after a while, she went back to sleep.

The next time Sweetie opened her eyes, she was greeted by the lovingly gaze of Motherly Slime. While always aware of her presence, Sweetie hadn’t consciously seen her since she was first adsorbed who knows how long ago and to suddenly see her smiling face right in front of her surprised her, or would have, if the constant stimulation she had been submitted too didn’t occupy so much of her attention. What really surprised the small unicorn filly was the appendage inside her mouth and throat dissipating. She had it inside her for so long she had no idea what to even do without it. Seconds later, her own head emerged from the green substance that made up the goo pony’s body and she felt the cold air from the cave hitting her coat and her wet mane splashing uncomfortably against her face. After all the time she spent inside of the warm goo, even a dark cave was too much for her senses as Sweetie couldn’t help but feel a shiver going down her spine, even an unexplainable feeling of confusion and abandonment. She had been picked up and absorbed by this strange pone against her will and kept inside her for so long she completely lost track of time. By all means, she would have given anything to run away from there, but now that she had her first breath of fresh air in a long time, she realized she didn’t want any of that. 

Sweetie took her time trying to speak, as if she had forgotten how to use words, and gather enough strength to use her vocal cords, once so powerful due to her singing, now rusted and weakened due to lack of use. But just as she was ready to finally beg Motherly Slime to pull her back in where it was safe and warm, the pony suddenly leaned forward and pressed her warm and soft lips against Sweetie’s. While the young filly didn’t understand her actions, they still made her happy as she now had something familiar to distract hr from the cold, dark cavern surround her. The young filly kissed her back, pressing her lips against the older mare’s as Motherly opened her mouth, inserting her more solid tongue inside the filly’s mouth. Missing the gooey tentacle she had been sucking on ever since she was absorbed, Sweetie gladly made out with the green mare, sucking on her oddly shaped tongue and twirling them together inside their mouths as the filly was desperate for the warmth and affection from stranger that didn’t feel as strange anymore. Distracted by the action going on, Sweetie soon forgot all about the cold air surrounding her as she lost track of time, which meant less and less for her, still entranced even as the appendage pushed past the filly’s tongue and into her throat, which really only satiated Sweetie’s longing for the gooey tentacle previously in place there, even if it didn’t go as deep or felt quite the same. 

What finally brought the small unicorn back to reality was the tongue, actually an ovipositor, bloating inside her mouth as a bulge entered past her lips, making its across her mouth and throat towards an opening that formed on the very tip of the appendage. Sweetie got scared for a second as it happened, not knowing what she was putting inside her. But as the oval object left the confines of the ovipositor and bulged against the filly’s throat, Sweetie recognized the same gooey consistency of the other tentacles penetrating her orifices and immediately calmed down by its familiarity. She even felt silly for doubting Motherly, she should have known by now she would never do anything to harm her. She giggled internally as she felt the “egg” smoothly making its way down her esophagus and landing softly on her stomach, which didn’t lose any time getting to work and breaking down the goo into the nutrients the filly’s still developing body needed so much, satiating the hunger she didn’t even notice she felt until that very moment. Not only relieved from finally getting some food, but also happy to feel Slime’s love and care for her, Sweetie eagerly continued to receive the nutritious eggs through her mouth, feeling full and content as they piled inside her faster than her stomach could digest them, to the point where her own belly was visibly bloated. Soon enough, her meal was over and Sweetie’s head was once again engulfed by the so familiar and comforting green goo, the happy, satisfied filly falling asleep soon after as her body continued to slowly process the nutrients her new mother gave her.

The next time she woke up, there was absolutely no fear or anxiety, only comfort and love as she was submerged in slime. Even when the time for her next meal came, Sweetie was eager and happy to swallow Motherly’s eggs as she knew what was to come. She looked forward to it, even. As day after day went by, the young unicorn filly got more and more used to the cycle of sleeping, waking up, being fed and sleeping again, being pleasured and loved all the while, and as she got comfortable with the routine, she cared less and less about her friends and family back in Ponyville. In fact, she was so content it was hard for her to even think straight, much less worry over or even remember her old life. Where did she live? Who were her friend again? What about her mother? The answer to that last question was the only one clear enough for the filly. Who could be her mother, if not the pony carrying her around inside her body at all times, always giving her all of the love in the world? At that point, that was all Sweetie cared for and all she needed to know as she once more fell asleep, completely comfortable and accepting of her new mother and home.

In reality, there was more than just comfort contributing to Sweetie’s ever decreasing questioning and resistance. Sweetie’s still developing body was quite vulnerable to Motherly Slime’s pheromones which helped biologically bond the two and keep the filly happy and docile, a task made much easier due to the goo pony’s love for the filly. With Sweetie now fully accepting that she was Mother Slime’s daughter, her body was now ready to mimic her mind, slowly regressing to an earlier stage where thinking or reasoning would become next to impossible. Not that she needed to, of course. Eventually, she would reach an early enough stage in which she, Motherly Slime’s chosen offspring, could finally become such, now literally. Sweetie would start her life anew, free from her past burdens and fears, with nothing in her world other than her mother’s never ending love, which is truly all she ever needed.