Sunset Shimmer took action her first day on Earth. Using the last of her Equestrian magic, she ambushed the Celestia of this world and enchanted her mind. She bid Celestia to guide her to “the seat of your power,” confident the mighty leader of Earth was now under her control.
 
A dingy office and hypnotized explanation later, Sunset learned it wasn’t so easy after all. She had wasted her magic on a principal, not a princess. This Celestia had no great magic or armies at her command, and could do nothing to aid Sunset in her quest for power.
 
Still, Sunset was flexible. After a very brief, contained temper tantrum, she got to work quizzing the principal on what she’d need to survive in this world. A few papers from Celestia’s desk smoothed the way into her school, and a few more set Sunset up with a place to eat and sleep.
 
Satisfied with the necessities, Sunset indulged her more curious questions. How do fingers work? Why do humans wear clothes? Why do they wear… shoes?
 
That last one led to her education on the strange “feet” humans have: soft and sensitive, unlike pony hooves. Ever the intellectual, Sunset bid Celestia bare her feet so the description could be tested.
 
Sunset’s initial, scientific prod brought a smile to her hypnotized subject. Sunset questioned it, and Celestia answered: human feet were ticklish for most, and erogenous for some. Celestia admitted hers were both, causing Sunset to recoil in a mad blush. The knowledge that she just sexually touched the human version of her hated ex-teacher… ew. Weird. And on the feet of all places.
 
…It was warm in here.
 
Sunset poked the foot again. For science.
 
And again.
 
Thinking about it, she could understand how feet could be erotic. They were a private part, always concealed and protected. They clearly emitted pheromones which caused the human face to flush, and were sensitive enough to please the owner as well as the handler.
 
Sunset closed her eyes and took a slow, deliberate smell of Celestia’s soft feet. Yes, there were definitely pheromones in there. Sunset would have to experiment with her own feet later. For now, she poked again and stared as the toes scrunched closed. She ran her finger down the sole, eliciting a giggle.
 
From herself.
 
Sunset slapped her hand over her mouth. Not the one on Celestia’s foot – that hand remained still. She glanced at the alien clock and stammered a question about human time. Celestia answered, and Sunset sighed in relief. The enchantment would last well into the evening, giving her plenty of time to… continue her research.
 
Biting her lip, Sunset rubbed her finger up and down the foot. Her tongue pressed the inside of her teeth, demanding to be let free. She saw no reason to deny it. Sunset brought her head level with the soles, while the hypnotized Celestia smiled on.