Canterlot Dreams II: Ultimate Adoration

"LAAARAAAAA! Hnnghh... aaah!!!" Twilight Sparkle's wings stiffened hard and Lara, the slime princess of Negaquestria, began to use her horn's sexual magic. Twilight felt her hands go gooey and slimy, her horn soften and swell, her clothes tear off. She could feel her body turn to slime and her mane soften and go gooey. Her fur, eyes and mane turned green and her cutie mark disappeared in a flash.
"Waaugh!" wailed Twilight as her former body softened and turned to slime. Twilight shut her eyes as her former self gave in to the slime beauty she was to become.

When she opened her eyes, she felt shocked to see she was futanari now.
"Relax... inhale.... and now exhale ..." Lara's horn glew and Twilight immediately began to love her new body.
"Mmm... let's find Pinkie..."