Author's Notes:

Story by the wonderful Wendy Crescent, featuring her OC, Starsong, and her Master, Firewire. Art by me <3

Find more variants of the art on the CTS tumblr and by searching my artist tag on derpibooru. Enjoy!

Clocktower Equestria West, Clocktower Research Laboratories, Intensive Stallion Studies Department

Starsong smirked as she watched her husband- no, her wife, slip behind the curtains to get changed.

The room she found herself in was quite pleasant. It was a pretty generic doctor’s office and nothing like hers back in canterlot. It was too sterile and formal in her opinion. It did give her a subtle thrill though - It made her feel powerful for once in her normally submissive life. The white coat draped over her form felt nice and familiar, even though it lacked the normal Lunar Guard heraldry she was used to. Her ears perked, she could hear her husband cursing.

He had lost a bet. She smirked a little as she thought about their new switching mechanic, fun little challenges between Dom and Pet; Winning meant they switched places. Thinking of it, it was more of a challenge than a bet. He had lost one, badly. The payoff - She got to be his Master for the day. She had all the power. With that power she instantly signed them up for a particularly fun-sounding Clocktower Research Labs experiment - To study the effects of mare’s clothing on submissive behaviour in stallions.

“What, by Luna’s big sexy plot, is this!?”

“It’s the outfit I picked for you, get dressed in it,” she scolded with a roll of her eyes. He was such a troublesome stallion at times. But she loved him dearly, even if he seemed obsessively scared about his masculinity being challenged. She smiled lightly from where she sat behind the desk, getting ready for the little role-play she had prepared; She had been instructed to treat this as any normal session, and she looked forwards to playing doctor.

Her eyes were drawn to the curtains, the telltale sounds of socks being slipped over hooves made her shiver slightly in anticipation. She took slow, deep breaths to calm herself. She needed to be calm and in control if this was to work. Closing her eyes for a moment she let her mind wander to that special place of hers, distancing herself from anything. Her muzzle set into a serene smile, one that mirrored Celestia’s gentle motherly smile. It was a mask of course, she was buzzing with excitement; But an air of professionalism was just what their session would need.

The nervous shuffle of hooves behind the curtain caught her attention only a second later. Opening her eyes she watched her pet’s blushing face poking around it. Starsong could see it all in his eyes. The excitement, the timidity, the meekness all battling to be the dominant emotion, all wrapped up neatly in a look of adoration.

“Come, no need to be shy little filly.” She cooed gently, like a proper doctor would while coaxing a nervous filly closer. Watching the obedience was almost intoxicating, The slow unsure step, the subtle way his tail pulled between his leg, ears splayed back ever so subtly. It was as if he was scared to offend her. “That’s it, atta filly.” She murmured encouragingly

Starsong took a moment to admire the graceful form of her mate, the well-defined curves of his agile flier body giving him a very feminine look in his new clothes. The white blouse and red pleated skirt hugging his flanks did nothing to cover up his privates. They accentuated his stallionhood, making the poor stallion look like she was about to star in a cheap low quality porno. The finishing touches to the outfit were her personal favourite though - baby blue and white striped socks.

She knew he was wearing matching panties, but he was doing his best to hide them.

Standing up from the soft, plushy pillow she couldn’t help but show off how much taller she was than her crossdressing husband. She flashed him a wicked smile that promised the feminine stallion a long night. A second later it was gone, but the effect was there. She could see him tremble, pressing down on the skirt she was wearing, trying her best to hide his- or rather her, arousal.

Prowling around the filly, she mentally nodded to herself; This was a filly not a strong masculine stallion. Starsong maintained that calm, motherly smile even as her eyes shamelessly wandered over her body. “Have you any idea how long it has been since your last check-up, miss Fire?” She asked, her tone stern but calm. “So long in fact that I’ve almost forgotten how cute you are. You look especially… adorable in that outfit.”

Watching the blush grow hotter was entertaining. “T-thank you, Doctor.” He mumbled. It was the most precious thing she had ever heard. Wordlessly Starsong stroked a hoof along his side, feeling up the soft silk. “Stand.” she commanded, grinning as Fire stood up obediently, forced to reveal everything to her.

Her cute little shaft was already throbbing with excitement, her cheeks a bright shade of crimson, her blush standing out against her coat, matching the dark red of her mane. Starsong watched her chest rise and fall rhythmically with apprehension and anticipation. The sight was enough to arouse her. She could already feel the first beads of her own arousal running down her inner thighs. A deep breath later she forced herself to remain calm and not ravage her patient just yet.

Starsong started her inspection with a sly smirk at the one way mirror, winking at the scientists she knew where observing and gathering data from behind it. She turned her attention to her patient’s plot. The skirt really did nothing to cover it. Her panties were on full display, her balls hugged snuggly by the frilly silk. “Hmm… you seem physically fit. We’ll do some test but … there’s the matter of a prostate exam.” She said casually, it was hard not to burst out laughing, or grinning menacingly.

Catching the subtle shift in posture, and the tell-tale signs of a mare ready to flee Starsong grabbed her by the mane. It was so much more fun to marehandle somepony physically than it was with magic. A mouth full of mane was worth the loud pleasured groan it coaxed from her patient. She wrestled her over to the mirror, pushing her up against it with her superior weight … it was beneficial at times to be tall mare.
Pressing her body to the mirror she snapped the cuffs on her hooves to make sure she was not going anywhere, pressing her marehood to Fire’s flank she started slowly grinding against that divine bubbly butt. “Hmm… You’ve been avoiding this for too long. It is going to happen.” She said, taking her patient’s left ear between her teeth nibbling lightly, relishing in the sounds of her squealing, amused by the sight of Fire’s panting fogging up the mirror.