[Note : I've been wanting to write this scene for a long time! I hope you enjoy!
(Also Frisk had their reasons for not volunteering)]
Ever since Toriel had opened Ebott School, she had made it crystal clear that monsters and humans alike were welcome there and all classes had to be mixed. Except for one : the magic class.
Which wasn't a school subject at all, but more of a way for monster children of all Ebott to meet up in the gym and practice their magic safely and away from humans. There was no homework, tests or grades here.
The school gym slowly filled with little monsters talking to each other excitedly, impatient to show their friends the latest tricks they had learned. That is, until they spotted a human talking to Toriel.
"…So if Sans says you can be trusted…" she told the human. "Oh, it looks like the children are all here. We should be able to start soon, Hisha."
Hisha nodded then started scratching the skin of her lower lip.
"Are you nervous?" the boss monster asked her.
"What gave it away?" she laughed nervously.
She peeled off a tiny patch of dry skin and let if fall to the floor.
"You could damage your skin", Toriel pointed out.
"Too late."
Then, the school gym's double door opened quickly and loudly, causing everyone to look in that direction and see Papyrus and Undyne enter. As usual whenever either of these two would volunteer at the school, the children instantly flocked to them.
While she wasn't the centre of attention anymore, Hisha took a deep breath and slightly shifted posture, standing taller and looking straight ahead.
"Ok, let's do this" she said to nobody in particular.
The attention shifted back to the human when Undyne and Papyrus, followed by the children, joined her and Toriel.
"Miss Toriel?" asked Kid. "Why is Hisha at the magic training?"
"There is a very good reason for this, my child", the teacher explained. "I wanted to show you the different effects magic can have on SOULs, and figured it would be easier to see on a human SOUL since they can safely appear outside their bodies. So I asked Hisha if she'd like to volunteer."
"Also Frisk didn't want to", the human added.
"And we respect their choice", Toriel replied, glaring at her briefly.
"CAN WE START THE DEMONSTRATION?" Papyrus asked.
The boss monster nodded and instructed the children to back away ; once they were at a safe distance, Undyne lightly pushed the skeleton towards the human, exclaiming "you go first!" while smiling from fin to fin.
"You may start now", Toriel told Papyrus while taking a few steps back.
Soon, Hisha's SOUL popped out of her chest to float in the air in front of her. She reached for it with her right hand but then froze, not daring to touch it. Then she looked down to something the monster children watching her couldn't see.
"Combat? Clémence? C'est ça le 'battle screen'?"[1] she thought aloud.
"OH, YOU'RE ALREADY BLUE", Papyrus pointed out.
"And… is- is that a bad thing?" the human asked.
"Not at all", Toriel reassured her. "Unlike monster SOULs, human SOULs can have different colours. Frisk's is red, for example. You being blue only means the difference between your normal state and you under the effects of Papyrus' blue magic won't be as visible as if you were a different colour."
"…Doesn't that kinda defy the whole purpose of-"
"This is why I asked both Papyrus and Undyne to come just in case."
Hisha nodded and Toriel continued on with her lesson :
"Once a human's SOUL is visible, they can move it around- not too far from their bodies though, as the two are still connected."
The human stared at the little blue heart in front of her for a second, then managed to move it in large circles all around her before stopping it in front of her again.
"AND THAT'S HOW YOU CAN DODGE MAGIC ATTACKS LIKE THESE!" Papyrus explained to her as he sent a few bones towards her SOUL ; she avoided them effortlessly.
"However, some monsters have the ability to change the way a SOUL moves", Toriel continued.
"THAT'S MY CUE!" the skeleton exclaimed. "HISHA! GET READY FOR MY BLUE ATTACK! ALSO, DON'T MOVE."
"…You're not gonna throw me to the ceiling are you?" Hisha asked, biting her lip nervously.
"OF COURSE NOT! WHY WOULD I DO THAT?"
Somewhat reassured, she did as instructed and remained perfectly still as light blue bones rushed towards her. Then her SOUL fell right to the floor and her body slouched slightly.
"I feel… heavier" she commented.
"THAT'S THE EFFECT OF BLUE MAGIC! I INCREASED GRAVITY ON YOU! BUT YOU CAN STILL PRESS A TO JUMP! HERE, TRY IT!"
Papyrus summoned a few more bones ; the first one took the human by surprised and hit the blue shape at her feet and then she barely avoided the others, body and SOUL jumping in unison.
"I swear if this is all a ruse to make me exercise…" she joked.
"This should be enough, Papyrus", Toriel stated.
The skeleton released Hisha from his magic and her SOUL floated back to its former place at the level of her chest.
"My turn now!" Undyne exclaimed, summoning a magic spear in her hand.
"…Pleasebegentle" Hisha pleaded, instinctively taking a step back.
"Let me heal her first", Toriel intervened, causing Hisha to sigh in relief.
She approached the human woman and lightly touched her shoulder, restoring her HP ; she then walked back to her previous place in front of her monster students.
"Now you can go, Undyne", she instructed.
"Alright!" the fish lady said. "Stay still!"
Hisha held her breath and closed her eyes as the magic spear touched her SOUL. The children gasped as it changed colour.
"Now you're green! Fuhuhuhu!"
"I… I can't move my legs!" the human cried out, her eyes opening wide.
Even though she could still turn her upper body as normal, her SOUL and lower body were now frozen in place no matter how hard she tried to break free.
"But you can block attacks with this!" Undyne told her as she handed her the magic spear.
She then took a few steps away from the human again and sent a few smaller spears straight to her SOUL. The first few hit, then Hisha started getting the hang of it and blocked the rest. Toriel declared it was enough and soon the human's SOUL turned blue again and went back into her chest, hidden once more. The boss monster healed her a second time.
"Of course, not every monster can use these types of magic", Toriel explained to the children. "And there are other types that can change a SOUL's colour. Maybe as you grow up you'll learn similar techniques, or maybe you won't. Either way is fine. Just remember not to directly touch someone's SOUL without permission."
The children asked a few more questions ; once she had answered them, the teacher declared it was time to go back to the usual schedule. The little monsters scattered all across the gym in small groups and started playing around with their various powers.
"…I guess I'm done here?" Hisha hesitated.
"Do you wish to leave?" Toriel asked.
"Well… I wouldn't want to bother anyone…" the human mumbled, playing with the hem of her shirt. "I mean, it's a time and place for monsters here right now so… I feel I probably shouldn't be there more than necessary…?"
"Then you are free to go", the boss monsters said. "Before you do, however… I was told your apartment burnt down ; maybe I can help you find a new one here in Ebott?"
"…Oh? You'd do that? Actually, we, heu…"
"You and your brother need a place to live" Toriel stated, "how could I not offer help?"
"I… I'll talk to him about it. Thanks."
Hisha said goodbye to Undyne and Toriel, "see you later" to Papyrus, then left the school gym.
The skeleton and the fish played around with the children (Kid even got another autograph from them both to add to their collection) and Toriel supervised it all, making sure nobody got hurt.
[1] : "Fight? Mercy? That's the 'battle screen'?"
Of course Shameless Self-Insert would see the battle screen in her language.