Read The Bridge
 
He glanced over to the changeling.  
“Pardon the curiosity though, but what have you been up to all this time in Canterlot?”
 
“Oh? Mostly going through the royal archives with Twilight for my studies. I did research some things about this world though.”
 
“Like?”
 
“Apparently my new species are shape shifters.”
 
Junior’s eyebrows raised in a bemused manner. Shape shifting, least by means outside of the natural lifecycle; was incredibly rare back home. Lea with her aquatic form and division ability was the only being he knew personally who could do it. And he could count other examples he knew of like Destroyah or Hedorah with one hand. The idea that Lea could now have even more of this ability had his interest. After all it was shape shifting magic that got him into this predicament to begin with.  
“Any limitations?”
 
“Apparently only to something of similar size, mass, and gender.”
 
“… Can you do it?”
 
Lea backed up a bit, and rubbed her chin. She’d read all the pages, memorized the notes, and knew all the details; but hadn’t attempted to pull it off fully just yet. She concentrated, squinting her eyes as her horn began to glimmer with enchanted light.  
“Well… lemme just try toooo-”
 
For a split second Lea’s entire body looked like it was ignited with white and green flames, nearly causing Junior to lurch forward to try and extinguish them. Before he could move an inch however, the changeling was replaced with a familiar purple alicorn. Standing before him was a replica of Twilight Sparkle. Or at least how Twilight Sparkle might look in seven years or so given the taller frame and different build. ‘Twilight’ lifted up her hoof and gasped, glee spreading over her face.  
“Oh?! Wow it actually worked!”
 
The voice was pretty close to the one Junior heard in the slide show, though it was a smidge deeper like one would associate with aging. Still, rest of the look was pretty well done. If he didn’t know it was her, Junior wouldn’t have recognized a hair on Lea’s head.
 
“Looks so, though I don’t remember Miss Sparkle being about my height. She must be too small for your body mass. Maybe try someone taller?”
 
‘Twilight’ nodded, her horn glowing once again as she concentrated.  
“Okay, just give me a moment…”
 
Same greenish fire, different equine. This time, the solar princess made an entrance. ‘Celestia’ fanned her wings and looked them over, running a hoof through her eternal mane. She grinned, very uncharacteristically wagging her tail like an excited puppy. Junior had to refrain from laughing at the sight of someone he’d seen so unfailingly regal act so chipper. Lea always did get excited about new spells.  
“Looks about right, nice work Lea.”
 
“Thanks, let me try a few mooore.”  
Another flare, another alicorn. Now Princess Luna was standing once again in her chamber. ‘Luna’ looked herself over, once again fanning her wings and feeling her ethereal mane with a hoof. Junior gave an amused nod, circling her a bit to give the new form a once over.  
“Hm… pretty close, could definitely pass as her from a distance; but your posing is a bit off. She holds herself a bit taller, doesn’t relax her wings as much.”
 
‘Luna’ drew a smirk with a raised eyebrow.  
“Spoken like someone of experience. Someone been spending a lot of time with the night princess. What have you been up too Gooojii?~”
 
She leaned in close to him, cracking a goofy grin. Junior narrowed his eyes and gently nudged her muzzle away with a hoof.
 
“She’s dropped by a few times at night to keep me company and kill time. Besides I fought her, tend to notice some things.”
 
‘Luna’ snickered, before disappearing into another flare of harmless flames. What emerged from the flames however was not anyone Junior had ever seen. Or rather, he’d never seen not looking at a mirror.
 
It was himself. Same crooked horn, same charcoal gray fur, the same spiky ivory hued mane. Only the body was a bit leaner built and the eyelashes noticeably longer. ‘Junior’ and Junior looked at each other a tad wide eyed.  
“Well… Now I know what I look like if my egg had been a bit colder when it was laid. You do that on purpose?”
 
‘Junior’ flushed a bit in the face, rubbing the back of her head in embarrassment.  
“Whoops! Was curious what would happen if I tried to disguise as a stallion. Welp, now we know.”
 
“Well it’s a nice trick nonetheless.”
 
‘Junior’ nodded before biting her lip. She looked out into the city below, remembering something that had been on her mind. Now with the shape shifting spell down, might as well give it a whirl.  
“Stand back a second, gonna try something.”
 
“What?”
 
“Make an original design from the others.”