"I'm so sorry for what I've put you through," Chrysalis said, glancing out down to the streets below where things were beginning to quiet down. "I don't know what I was thinking, when I went after him instead of you from the start, but now." Chrysalis smiled warmly at Cadance, revealing a whole lot of fangs in the process. "Now we can truly be together." Sickly eldritch energy washed over the queen, removing black chitin and replacing it with white fur. Moments later a new mare stood in the changeling's place.
"Oh my," Fluttershy breathed quietly, at the sight of the decidedly attractive mare shaking her new blue mane out. She was slightly smaller than even Twilight Sparkle, though had a far more toned and athletic figure, while yet remaining unfeasibly cute.
Twilight Sparkle looked up from her still completely insensible brother, to what could have been her brother's twin sister, that she knew full well that they didn't in fact have, and gritted her teeth hard. "Oh you have got to be kidding me..."
"You can call me Gleaming Shield if you like," the new mare whispered huskily, as she advanced on Cadance.
"Darlings, we don't seem to be in danger anymore, so would it be terribly gauche of me to drool?" Rarity asked. With the exception of the changeling lord who had paused in dismantling the cocoon to facehoof, Pinkie Pie who was laughing so hard she might sprain something, and Rainbow Dash who just looked puzzled, everypony else was ignoring her to stare for one reason or another. "I'll just go right ahead then," she added quietly, as nopony was paying her attention anyway.
"Oh my," muttered Applejack under her breath. She'd lived a life of totally unblemished heterosexuality up to this point, but 'Gleaming Shield' was making a great case for some flexibility on that viewpoint. She fanned herself with her hat and tried to think about the sight of Granny Smith on bath-day.
"Now that just isn't right," Spike reckoned out loud, from the statue he'd taken refuge behind. Seeing a mare version of the stallion he'd always looked up to and respected was odd enough, but that she possibly had an even nicer coat than his beloved lady Rarity, now that was just unacceptable. "Changelings really are evil," he said to himself.
http://www.fimfiction.net/story/134147/1/all-for-you/chapter-1-a-bond-undone