Rarity shut the door behind her, sighing as she was finally out of the pouring rain. The storm had started out of nowhere and caught her off guard, and so she'd darted into the nearest building without looking at what kind of store it was. But now, looking around, she found herself in some sort of antique store, shelves upon shelves littered with all manner of ancient trinkets and baubles. At the counter sat a bored woman reading a magazine, looking as though she would rather be anywhere else.
"Excuse me, is it alright if I look around until the storm passes?"
"Yeah, whatever."
Rarity began to wander the hallways, until she caught sight of her own reflection, coming from a mirror in the corner. The mirror was heart-shaped, only slightly taller than Rarity, and encased in a pearl-encrusted frame. Well, faux pearls, that is. They looked convincing enough, but Rarity knew her gems. Rarity frowned at her reflection, she hadn't been fast enough to keep the rain from mussing her hair, and she set to fixing it. As she did so, her eyes wandered to the rest of her body. The rainwater had soaked her clothes, making them cling to her body in a way that would probably be sexy if she wasn't so skinny.
Mirror, mirror on the wall, my boobs and butt are far too small... She jokingly thought to herself.
Just then, however, her reflection began to change, breasts filling out, hips widening, thighs thickening. Rarity blinked and looked down, but her body was the same as it had always been. She looked back up, and her more curvaceous reflection looked back at her.
I can do this, and more...
The words burned into Rarity's head, as if her own thoughts, but clearly coming from somewhere else.
"Wh-what?"
Take me with you...
Rarity took a step back. Something was off here. But... She looked so good with bigger breasts....
"Um, excuse me, how much for this mirror?"
Rarity rushed back to her dorm, not stopping until she was in her room, mounting the mirror onto her wall.
"Okay, I've taken you to my room..." She said, looking at her own reflection. At this, her reflection seemed to shift, turning a deep purple, clothes melting away, and loosing all facial features save for it's bright, sparkling eyes.
I am Luster... I was created to make the world a more beautiful place...
"Well, it seems you and I have a lot in common, then!" Rarity smiled, "Are you trapped in there?"
No... The mirror is me... This body is simply an illusion... It seems to make people more...Comfortable when interfacing with me...
"I see..." Rarity nodded
Thank you for bringing me here... That store was... So quiet....As thanks, I will fulfill my promise...
At this, each of the pearls around the frame began to glow. Luster pressed their body against the glass of the mirror, and slid through, reaching toward Rarity and, before Rarity could react, pulled her into a deep kiss! As their lips touched, Rarity felt a warmth flow into her. Additional arms came out of Luster, massaging more of that warmth into Rarity's body, caressing her breasts, rubbing her thighs, lifting Rarity off of the ground as more arms worked her body.
"Oooh...." Rarity moaned, beginning to feel aroused from the stimulation. Slowly, her breasts began to swell, Luster unbuttoning her blouse to make room for them, while unhooking and removing her bra. Meanwhile, her skirt felt tighter around her growing butt, riding higher on her legs.
Finally, Rarity was gently placed back on the ground, Luster retreating back into their mirror. As the warmth passed, Rarity came back to senses, gasping to find that her breasts had gone from B to D-cups, and turning around to find a perky butt as well. Seeing this, Rarity...