Sunset sighed, knowing she was quiet tied up with everything Celestia had against her. Of course she didn't know if Celestia had evidence of it, but given how she was principal and happened to know many things even she didn't catch wind off-she was sure she didn't want to take any chances. "Alright, alright," The blonde redhead as she stood up, still being easily dwarfed by the tall headmastress, "I'll teach you, but you must promise you won't teach others as well."
"Done." Celestia said quickly as she and Sunset shook on it as they stepped outside. Sunset looking around for a good place to start, it was better that they were alone, she didn't want people to panic immediately-even if she had to agree it was part of the fun. Luckily at these times after school, no one was around much a few students, some cleaning staff, but for the most part, generally alone as Sunset took Principal Celestia to the back of the bleachers near the soccer field.
"Okay," Sunset calmly as she took a deep breath to begin her lesson. "First off the important lesson of changing your size, or anyone else's, is to have magic on your side for sure," Celestia listened well but only gave her a look that it was obvious, "Right, so while I'm not sure if you can access magic at all," Sunset summoned a red glow from her hands as she passed it off to Celestia, "I'm going to give you a bit so you can get started." The red aura quickly changed to that of golden as the magic very easily resonated with the principal as Celestia purred a bit from the feeling.
"Oh I like this," She joked as she began to wave her hands as the glow followed as she was getting amazed by it. Sunset smirked before she shook her head and continued. "Right now, focus a little bit and...imagine yourself a little taller."
"How much?"
"Well...uh....as tall as the bleachers, just do so little by little, and hopefully the magic will take effect." Celestia lifted an eyebrow at how easy it sounded. "I thought some form of spell or incantation had to be made."
"Well yes you're right, but usually the best way to learn about how magic works for beginners is to let them experience raw potential and then ease them to learn discipline." It seemed to strange for Celestia to hear but it sounded fine in principle. "Come on just give it a try." Sunset said, reassuring her she was there if something bad happened.
"Okay," Celestia said as she took a deep breath, "Think tall." Imagining herself quite easily being as tall as the bleachers, however given the unbound nature of raw magic it was very nerve wracking what would happen given how Celestia was.