You aren't exactly a model student.

You see, generally, portals can only be opened to places one has been - because one can only visualize such a place in one's mind's eye with enough precise detail, and therefore open a portal to that location. A field is a field, but a field with the knowledge of the surrounding landscape, the precise distance from the next mountain, and the feel of the earth against one's bare feet, the smell of the wheat, the precise season, et cetera. One minor mistake, one missed detail, and one may end up in an entirely different location than one had originally imagined.

Following the initial two decades of training, every young adept mage took aptitude tests to gauge which field of magic they should specialize in. For portalism, initiates are tasked with opening portals to places they've been to in the past. Perhaps their bedroom, or a garden in the family estate. When it was your turn, you somehow managed to open a portal to a dimension populated almost entirely by writhing tentacles.

One of which reached out of the portal and seized you by your waist, dragging you in.

You were told that the entire academy stood aghast in silence for nearly five seconds before someone said, "We should do something."

Except nothing was done, because no one knew exactly where you had portaled yourself. Victim blaming, a Druchire pastime.

To everyone's surprise, you survived, despite having every hole in your body violated for what felt like days. You were horrified at first, but when your body adjusted to the ravishment, you fell into a haze of pleasure. Then, to your horror, you felt the tentacles that had invaded your quim pulse, swell, then pulse again, as you felt tiny lumps being **** into the depths of your womb. This breach of your cervix went on for a day and while pleasurable at first, it became unbearable as you felt your uterus swell. It did not take long for you to realize that you were being infested with the otherworldly creature's eggs. Soon after, more phallic shaped tentacles invaded your cunt as well, firing load after load of hot cum into your recently infested womb in what you could only imagine was an effort to impregnate you.

You only managed to escape by casting a portal around your body to the Master of Portal's - Sepp Ventor - classroom in the academy, landing right in front of him as he was lecturing - writhing in **** coital pleasure with severed tentacles - cut from the closure of the portal - flailing around you and sticky, tentacle-beast fluids and eggs gushing from your well-fucked pussy.

Your typically flat, toned belly was distended from the monstrous mixture of putrid, viscous juices and eggs in your womb as if you were three months pregnant. Your hair was a tangled mess and your corset and garter belt were torn to shreds. Your stockings had so many holes and runs torn into them from the friction of the tentacles that your long, lithe legs were basically bare. Your toes were caked in monster cum. Only your make-up remained pristine - even in spite of the fucking, you had maintained your glamour charm.

You have standards: even if you were condemned to become tentacle-beast breeding stock, you were going to look really good doing it.

With a single stroke, Master Ventor had cast a magic-hand enchantment and ripped the remaining tentacles out of your well-fucked holes. You recall the sudden release of pressure well: thick ropes of cum and a few eggs gushed out of your womb, and straight into the face of one of your most hated rivals, Seraphine, a prissy, stuck-up, bright-elf fetishist who always dyed her hair platinum blonde and glamoured her skin until it was golden bronze.

Despite this entrance, and perhaps, because of it, Master Ventor immediately adopted you as his protege: reasoning that your ability to dreamwalk, impressive photographic memory, attunement to the source, and lust for power(amongst other things) made you the ideal candidate. In other cultures, you **** would have been treated as a victim and ultimately shunned as damaged goods, but in Druchire society, you were seen as a victor. That your mind had not been broken by the experience of constant **** (**** orgasms) demonstrated that you had fortitude, would thrive at Druchire orgies, and eagerly use sex as an asset while serving as an agent of the Dark Tower. That your body's immune system resisted pregnancy by attacking the potent, monstrous seed before it could fertilize the beasts' eggs, only bolstered your status as a product of near-perfect breeding, and proved that not only were you not a liability, but that you would likely brush off inevitable sexual advances made by your allies while accompanying Druchire armies abroad, and endure **** if and when you were ever captured by the enemy. Indeed, Seraphine somehow became pregnant from ingesting the cum and egg mixture your quim spewed into her mouth, and vomited vile Unbidden spawn for weeks.

And so, your meteoric rise at the Dark Spire began... as soon as you expelled the thousands of unfertilized tentacle-monster eggs from your womb, a painstakingly pleasurable experience (short of surgery, which was out of the question, a cervical orgasm was the only thing that could cause uterine contractions strong enough to expel the eggs through the tight gates of your cervix) that you endured under the close medical domination of Flor Zwin, the Mistress of Medical Arts at the Spire and close family friend and secret-keeper. You were allowed back to your studies as soon as your belly became flat again.

In secret, you return to the tentacle dimension to be bred (unsuccessfully) on a regular basis. As you and Mistress Zwin were working on fixing your predicament, you discovered that the eggs within you emanated powerful magical Source energy, which your body readily absorbed. It made some sense - after all, tentacle beasts, like other forms of the Unbidden, were creatures corrupted by exposure to the awful power of Source storms, and therefore were themselves absolutely soaked in the malignant energy of the Source. After much examination, potent transparency spells, and a strong stomach on the part of Mistress Zwin, the two of you made interesting discoveries: studies into your body also led to breakthroughs in the reproductive cycles of the so-called tentacle beasts - in reality a plant-like organism that traced its origin to deep sea worms that had been somehow corrupted by the malignant powers of pure Source energy. The beasts had both male and female sexual organs, not unlike a flowering plant, and infested warm-blooded females with parasitic eggs that would implant into the host's uterus, grow in size as they leeched nutrients from the host, flood their host's bloodstream with potent hormones to increase libido and ease penetration, before the host is ultimately impregnated by the tentacle beast's male sexual organ. The fertilized eggs would then rapidly develop, and potentially consume the host from inside out, turning the host into a new, walking tentacle beast.

This, rather moribund information aside, more importantly, you discovered that the potency of your magical powers increased by proportional orders of magnitude with the number of eggs attached to your uterine walls (your womb holds more, but obviously there is only enough surface area for so many).

While you were merely a bright, but mediocre, sorceress who was only included among the highest class of initiates because of your otherworldly beauty and freakishly strong genetics, the power your body drew from the pure Source coursing through the unfertilized eggs elevated your power levels to incredible levels. While carrying a full load of maybe one hundred or so eggs in your womb (by full, you mean the maximum amount your womb could hold so that your belly was distended, but not visibly pregnant, which was still a shocking amount, thanks to how tight and toned your abs were), you could open and maintain larger portals than most master portalists. As you drained magical energy from the swollen eggs, they would die, detach from your uterine walls, while other unspent eggs would take its place, swell, and the process would repeat again. Eventually, as pressure built within your womb from the eggs being used, you'd experience an orgasmic form fo labor, and ultimately, the eggs would be expelled from your body... by birth.

You were initially hesitant to pursue power in such an unconventional manner, but in Druchire magical society, uncommon ways of obtaining unlimited power were actually... exceptionally common. For example, Master Ventor himself was rumored to have forcefully bound the souls of former failed pupils to the sickly, gnarled amber-studded staff that never left his side - each amber stone representing yet another soul. The Crone - the widely feared mistress of the Cauldron, an immense fortress built into an inert volcano overlooking the Black City responsible for the production of the Druchire's main-line Husk infantry - was rumored to have mastered a technique to tap into her own life-**** (and others') to fuel her spells... though this came at great expense to her health and to the hundreds of slaves whose life-**** she drained on a daily basis to maintain what little was left of her former beauty.

On the bright side, this "technique" - if you could call it that - was truly unique to you and your incredible immune response to foreign sperm. While it was known that taking a huge, hot load of tentacle cum directly into one's orifices could result in a temporary boost to power, deliberately letting tentacle beasts infest you with eggs was unheard of. The risk of a horrific pregnancy with tentacle beasts was typically too high for most, but no tentacle beast has ever been able to impregnate the eggs within you... yet. So, the unfertilized eggs in your womb acted almost like batteries, and you could host hundreds of eggs within you at a time. Though it was... inconvenient and uncomfortably orgasmic when you eventually had to, ahem, expel the used eggs from your womb (it was worse when you had to hold "discharged" eggs inside you because it was impossible to expel them from your womb due to social norms), it provided you with a far more reliable means of getting a massive power boost.

There were other effects too, some negative (though that's a matter of perspective). The presence of the foreign, unfertilized eggs in your womb seemed to fool your body into believing that you were constantly ready to be impregnated - the hormones they induced your uterus and ovaries to release into your body made you hornier than even the most promiscuous Druchire women. Once, while you had some standards... you now almost had none except for your perverse affinity for all sex interracial. You were also constantly dripping wet. Mere minutes after you put on a new slinky thong, it would become soaked through with your juices.

But the hormones had other positive effects as well. Your pale porcelain skin took on a healthy, post-coital glow, your hips - though still narrow by human standards - widened somewhat, giving you an incredibly well-defined thigh gap (helped by your svelte thighs and long legs) which emphasized your subtle cameltoe perfectly and what Druchire men would refer to as "birthing hips," your breasts - though still very small - became firm, so you weren't completely flat-chested anymore, and your nipples became puffy, ultra-sensitive, and pert. Your toned ass remained the same, fairly small except widened slightly in line with your hips. You ceased to have gods-awful periods (perhaps, the best change of all). It was as if you were always ovulating.

You initially feared that your svelte figure was going to turn into some preposterously proportioned bimbo's, but the changes stopped after around two years, and you were left with an absolutely slender but voluptuous form. You could not have accidentally stumbled into greater fortune. And after decades of exposure to the tentacle eggs, Mistress Zwin theorized that the physical changes to your body were likely permanent. You didn't complain.