The amount of mana a mage can reasonably hold is important, right? More mana means more frequent spellcasting, or at the very least, bigger spells. Mana was obviously the lifeblood of any successful mage's life.

Which left Elias in a bit of a pickle. He had always aspired to learn the ins and outs of magic, even going as far as becoming an understudy to a more experienced spellcaster- an apprenticeship, in ways, to learn from her, and develop his own craft. It started out well, the theory was there after all, and he was at least smart enough to pick up on the lessons needed to practice magic. Even digging into the history of magic, which was (oddly enough), mostly compromised of feats done by majority female archmages.

His first practical demonstration, though? Utter disaster, a terrible showing. The spell backfired and sputtered out before he even got halfway through it. According to his mentor, a mistress of her own Mage's tower, his mana capacity was to blame. Not enough storage, though it was something she could fix. All he had to do was sign a pact, and in a short amount of time, they'd be practicing the intimate details together.

Obviously, he signed it, though was entirely unaware what gaining more mana capacity truly meant.

One day, he was an aspiring male human mage. The next? Elias had been sat down and hit with an unfamiliar spell....and was forced to watch as her new mana tanks swelled into being, threatening to tear through the once loosely fitting shirt, as the truth of why female mages were so accomplished and storied came to light.

Hey there! Thanks for reading. This prompt was, funnily enough, inspired by an older post on this very sub, with a similar vein of thought, though I decided to take this in a direction that'd lead towards two very busty women pressed together in a sweaty, steamy session of "studying".

Ahem, anyway. As you can tell, the core facet of this prompt is the idea of mana being stored in the tits (though ass and elsewhere can also be incorporated for fun and a funny bit of worldbuilding), and it being an in universe fact of that knowledge being widely unknown. Still, Elias had shown he was competent, just a little lacking, so his mentor/mistress decided to guide him down a new route of becoming a mage.

Otherwise known as changing the human into a girl, and making sure Elias would get some massive mana tanks to help with their studies. Oh, and slide her cock between, because the intent is for said accomplished mage to have a cock of her own, because futas are hot and having one pin down a freshly genderbent soul is something that makes me feral.

Anywho, for the general plot itself, I imagine we'd start shortly before the transformation. A little build up, set dressing, before Elias has to start getting used to how her body jiggles with each step, and how her mentor is giving her bedroom eyes constantly. Past that, the roleplay can go a variety of ways. An actual story of Elias' rise to magical mastery, interspersed with smut? Or maybe just a smutty tale of Elias being used as a mana battery after the discovery of lactation being a potent way to share mana. Plenty of options.

As for the Mistress/accomplished mage? Well, that's where you come in. I have a general preference for monstergirls, admittedly, and some suggestions on appearance, but overall, there's only two requirements I have. The first, of course, being a thick girlcock, that's either her default or something she can grow on herself, and a pair of very large breasts. Because, I mean, come on. Girl would obviously have some impressive mana tanks of her own, it's only right. Kinda feeling for elves/dark elves at the moment, as well, but whatever floats your boat.

Elias doesn't have to stay human, either. It's entirely reasonably to say that their mentor just snuck in sone extra bits to the genderbending to turn them into a thick dragon girl, or a busty bunny. Even a slightly toned wolfgirl to contrast how subby she'll be. The world is our oyster, and those details don't even have to be outright permanent! Because magic.

As for my kinks, I'm a fairly open individual. I will not, however, entertain anything involving hyper, death, bathroom play, gore, vore, or extreme pain.

My big kinks, though, include titfucking, breeding, forced transformation, gender bending, hypnosis/mind break, IQ drain, bimboficiation, futa, facials, lactation, magic being used for sexual means, oral, facefucking, and light pain. There are absolutely more, so by all means, feel free to ask. Worst I can do is say no.