“Are you sure this will work?” asked Luna as apprehension got the better of the proud princess as she stood sheepishly in front of her sisters’ dearest student. The nocturnal mare becoming rather self-conscious as she milled in a meek manner not befitting her title, making the tall alicorn rather uncomfortable as Twilight looked at her like a lab experiment.

“Positive, this adipose enlargement is a rather standard procedure, though you might experience some tingling,” said Twilight confidently as she turned a page in the textbook she was using for reference, as she read ahead in the procedure just to make sure there were no olde timey surprises in this beautification book. The purple pony scouring a lexicon of old tomes to find the book she needed to complete the odd appeal for the self-conscious alicorn, as no matter their station the princess of friendship always had time to help a friend.

“Good… Good… so it will safely increase my…. royal assets?” replied Luna as she attempted to remain couth in this strictly lewd request she had asked of the bookworm. The knowledgeable mare’s opinion doing wonders at dissuading some of Luna’s concerns, as though beauty was pain, the midnight mare had had more than enough of that so the fact it was negatable was a plus all things considered.

“Some of the magic may cascade into your hips though, but the results will be negligible, though I am curious how this metabolis…..” prattled Twilight as she grew excited about what she was about to do, as the academic alicorn always relished the opportunity to try new spells in a controlled environment to further her expansive side studies. Luna looking at the mare as she rattled off until with her normal imperial grace she gave a versed cough to inform the mare she was going into a tangent.

“May we begin?” enquired Luna, her hand scratching her neck nervously as her demeanour lacked the normal fire, as she just wanted her assets to match her solar sister as fast as possible, and this lecture level small talk was stalling the situation.

“Yes, yes, sorry I am just rather excited to have a practical attempt at Malmar’s mammary modification,” apologized Twilight, who scrunched up her face in concentration, before her horn hummed to life and she took steady aim at Luna’s regal rack. The crackle of magic cascading off the resonating rod, before with a swift zap Luna felt the force of fizzing energy hit her square in her already busty bosom. The blue alicorn gasping from the blow as she felt the purple energy dance across her skin as a shiver of coppery power as Twilight’s will was made real in a manner only a powerful mage might.

The jolt lasting for a few moments, electricity sparking before fading to nothing as Luna looked down on her breasts to see they remained unchanged. The sight also surprising Twilight as she cocked her eyebrow and turned back to her book, in case she had missed something as Luna’s boobs had failed to balloon. Luna bringing her hands to her meaty melons, curious whether that light show had been a dud, before with a sudden twitch she felt her knockers spasm to life. The alicorn going wide-eyed at the queer sensation, as her mouth opened to ask a question that didn’t come, as she suddenly felt her bubbly globes grow in her hands in a sudden expansion.

Twilight glancing back just in time to see the often-ogled orbs inflating at a rapid pace as Luna’s curves swelled exponentially as the magic ran its course. The cusp coquettish at first as Luna felt her mammary mash against her hand before the growth applied a steady pressure, pushing her hand away as her chest continued to grow into two bulging pillows that her bra began to complain about as it strained to contain the exponential growth. The freckled spheres continuing to grow as the areola began to peek over the restricting material, as Luna put up her hands as she tried to manage the mammary mudflow.

Luna was lost for words, as her hands tried to stop the doughy flesh from expanding further, her body wobbling as she adjusted to her new centre of gravity all the while. The cleavage billowing outwards not unlike the mare’s flowing mane, as Luna used both her hands in a fruitless attempt to hold back the titty tide. Twilight gawking in awe as the feminine mounds rose into mighty mountains, Luna blushing as the buttery breasts scrunched upon her palms in a deviant display as her attempts at effeminate gains had expanded beyond her desired limits.

The seeping expanse oozing to a stop as Luna’s breasts were now more like mirrored beanbags instead of the basketballs she had desired as her mammaries dwarfed her head as salacious slabs of tempting tissue. Luna’s breathing quickening as a wave of embarrassment hit her, as she felt the mass hanging off her chest sway slightly as her garments groaned in complaint as the growth finally settled. The udders undulating slightly with each breath as they came to a rest as the magic ran their course, leaving the mighty knockers lightly grinding against each other as if begging for a motorboating. Twilight opening her mouth to nervously say something, before with a twang the shoulder strap of the right breast gave as it could no longer handle the pressure of the gargantuan pleasure pillow beneath. Both Twilight and Luna flinching at the startling sound before giving an uneasy smile the over-ambitious student gave her insightful input.

“I might have overdone it….”

................................

Luna went to Twilight regarding some discreet breast expansion. Mistakes were made...

Another collab between me and Crazy ( https://derpibooru.org/profiles/Crazy+Water ).

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