Trixie couldn’t help but grin mischeviously when she saw Rarity striding up the path with the goods folded neatly under her arm, steppingaway from her wagon’s window to go out and meet her personally. She couldn’t help but recall her past experiences with Twilight Sparkle and her companions, though she never felt any animosity towards them, far from it. No… but old habits did die hard, and ever since she’d picked up on some more esoteric spells mentioned in the book Twilight had given her, she was eager to show off this knowledge in her next show, and by Celestia it would be a big one~
 
“Rarity! A pleasure to see you, truly!” She said with a gregarious tone, evoking a smile from the white-coated mare who had come to grown quite accustomed to Trixie’s bombastic manner.
 
“Always, darling, always. Well… hostile takeovers notwithstanding, heh.” The fashionista said, getting a laugh out of Trixie.
 
“Mmm, right, right. Well, let’s see it~ Knowing your work, I’m sure it’ll be truly magnificent! An outfit worthy of the performance, no doubt!” Trixie stated, already putting some of her magic into play~
 
Rarity giggled and hummed softly, feeling compelled to go along with this flattery. “Well, not to brag, but I do think this is one of the finer pieces I’ve done in a while. Oh, but the theme does… well, interest me.” She said, producing a violet corset and pink, plumed headdress. “What, uh… what are you planning, if I might ask?” The seamstress found her gaze shifting to Trixie’s much larger bust, something she’d noticed the other day, though dared not address in public. She blinked a few times then when a glimmering light caught her eye, swearing she could see the phatom image of diamons in her peripheral vision…  
“Oh, this? This is for my new assistant, of course!_{” Trixie stated with a smile, putting a little more power into the spell now, her horn’s glow growing more and more intense.
 
“Oh… oh? A-assistant…?” Rarity asked, gasping when Trixie stepped forward and pulled her into a tight embrace, finally noticing the oddly alluring glow of the unicorn’s horn.
 
“Yes, dear, Trixie’s new assistant} It’s your uniform, don’t you know?” She said to the dazed mare, getting nothing more than a slight nod out of her at first.
 
“Oh… w-wait, but… but I… I own a boutique, a-and…” Rarity objected, starting to actually see them now, gorgeous diamonds right in front of her eyes, distracting her, dancing around in strange, spiralling paterns…
 
“Mmm, yes dear, but think of the sales; your magnificent designs on Trixie’s stage are sure to be the talk of Equestria~ Paying somepony to watch your store for you would be well worth the investment, wouldn’t it?_{” Trixie said, watching the mare fall deeper and deeper into trance, seeing the beginnings of a smile starting to form.
 
In Rarity’s mind it certainly wasn’t the first choice she’d have made in marketting her outfits, but… well, Trixie did have a point. It would get her out there, and the though of being seen in such revealing attire by so many ponies had its dark appeal to her. Very uncouth, very unladylike, but…
 
“Be a good girl, now, and try it on for Mistress}” Trixie said, breaking the Unicorn’s line of thought for a moment.  
Had she just said Mistress? Somehow that didn’t seem right, but before she could indulge that thought a powerful flash blinded her for a moment, making her gasp. Trixie’s horn had stopped glowing, but the diamonds still twinkled and danced in Rariy’s eyes, compelling her to obey and reinforcing this with a truly wonderful sense of euphoria~ “Y-yes, Mistress Trixie%” She replied, shuddering softly as she stripped naked. Not long after she’d slipped into the corset, feeling elated seeing her mistress smile, striking several poses for her pleasure.
 
“Good girl%” Trixie said, grinning as she had before, inspecting her thrall carefully. “You’ll make a wonderful assistant indeed~”