Com from Marauder6272! Colours and story by Blues 64!
 
STORY TIME
 
“Nnnnyarh%” Twilight Sparkle yawned as she stretched her left arm high into the air. She leaned forward slightly before relaxing her posture, Twilight’s arm fell to her side. Her eyes searched the shelves of the castle library before Twilight Sparkle moved in to select a book. She pulled a brownish book back by the top of the spine with a single finger, allowing it to fall neatly into the alicorn’s palm. Twilight Sparkle then took hold of one side of the laboratory coat and peeled it off. The moment a few inches of cleavage was exposed, the lab coat’s enchantment was dispelled. Twilight Sparkle’s massive breasts spilled outwards and shoved the rest of the lab coat aside. Her breasts forced their way forward and Twilight silently let the coat slide of her shoulders and onto the floor. She quickly readjusted her balance to compensate for the shift in gravity, although she stumbled forward ever so slightly.
 
“Feels good to relax… now then…” Twilight Sparkle said to nopony. Twilight leaned forward and rested upon her naked violet breast cushions, then she opened the book to a seemingly random page. She read in silence, aside from a few ‘Hmmm…‘s, ‘uh huh…’ and ‘Oh!‘s.
 
 
Her eyes flew across the page, reading reach word like it was simply another cloud along her flight. They jumped from side to side like a type writer absorbing information instead of depositing it. After thirty minutes of reading Twilight Sparkle’s demeanor changed. The last passage was a bit of a surprise to her. Twilight placed a finger down at the start of the paragraph and read it aloud.
 
“‘In our humble opinion, Twilight Sparkle, the alicorn of friendship, has seen a sudden explosion in popularity. This is presumably thanks to the ‘alicorn transformation’ and the benefits that it brought along with her. Indeed, much like the other alicorns, her breasts have swelled to massive sizes and due to some rather explicit photos, Twilight Sparkle has surpassed Princess Luna in popularity, according to our polls’” Twilight Sparkle finished reading and nodded in understanding. She had read it correctly the first time. Her puzzled eyes browsed the page again, piecing together a few other facts that the alicorn may have missed.
 
“This isn’t a tabloid and it’s quite recent too… Now I understand why Rarity gifted me this book the other day… it’s got quite the surprising insight towards the masses… As the Princess of Friendship I do need to spread word about my mission… perhaps increasing my popularity will help that,” Twilight concluded quickly. The puzzle was seemingly in place, pieced together easily by her sharp mind.
 
“Of course… I should check these facts against other books… or! Ooooor!” Twilight Sparkle’s lips pursed into a clever grin. A grin that her friends knew definitively as the ‘experimentation’ look. Twilight Sparkle, using her magic, quickly summoned a scroll and quill to her side. She made a couple notes that referenced the book she had just read then a couple of her own thoughts on the matter.
 
 
Once Twilight Sparkle was satisfied with her notes, she began to concentrate. Her magical horn answered the call quickly and it was surrounded with a brilliant glowing aura of fuchsia light. It took a few moments longer for its effects to become visible. A snake of magic slithered, from the tip of her horn, through the air and began to coil around the alicorn’s buttocks. Once a full circle was complete the fuchsia light began to shine brighter and the magic began its task. The enchantment slowly soaked into Twilight Sparkle’s violet ass and began to expand it. Despite being a simple spell, Twilight found herself having to redouble her focus. Much to the mare’s surprise, the inflation felt rather good. More than good, quite pleasurable in fact! Twilight Sparkle bit her lower lip, holding in deep moans of bliss. Her eyebrows twitched slightly as her own senses tried to deny the delightful swelling spell. Twilight Sparkle’s once, nearly flat buttocks, had now swelled to resemble a pair of firm volleyballs. The twin cheeks were perfectly round and a stark contrast to Twilight’s lithe figure, aside from her mountainous bosom.
 
Soon her ass was marching outwards, no longer satisfied with swelling upwards, it searched to the sides for more room to grow. Her buttocks grew to the sides, over her thighs and further towards the ground. Despite growing for a solid three minutes, the pleasure had not faded in the least. Each inch of growth only sent more tingles of pleasure down her spine. Waves of pleasure roamed freely across her body causing Twilight Sparkle’s fingers to shudder and the magic to flicker.
 
“J-just a little longer…” Twilight convinced herself, unaware of how large she had grown. “Just… an extra… minute% Oooooooh~” Twilight Sparkle finally moaned. She arched her back slight as she moaned like a wolf would howl to the moon.
 
 
Then it was over. The ten minutes of magical inflation felt like seconds to Twilight Sparkle. She let out a deep, satisfied, sigh. Twilight turned her head backwards and smiled at the results of her spell. Her ass has grown to a tremendous proportions, one of which rivaled her alicorn sized breasts! Despite the added weight, Twilight Sparkle did not feel encumbered or constrained in the slightest thanks to a spell she had cast in conjuncture with the growth.
 
“If my theory is correct then should double my popularity within the week. Ponies like both ‘tits and ass’ and by having both then I should see a jump! Thus! My mission of spreading friendship will be all the easier!” Twilight Sparkle’s face beamed gleefully at her clever plot. Her eyes then turned towards the door and she blinked twice.
 
“Of course I may have forgotten doors in my calculations…” Twilight Sparkle blushed slightly as she judged the size of door frame and compared her enlarged ass. There would be little chance of fitting through it with ease, perhaps teleportation was the best movement option.