Tartarus High

“Right...what are we going to do about me looking like this?” Twilight asked when she and Celestia were hovering outside of Ponyville.

“Well first we need to get you to a hospital to make sure everything will heal right, and your leg is broken so you shouldn't walk on it.” Celestia said.

“Right, well...for now I'll just use an illusion spell.” Twilight said. In a few moments she looked normal and was using her jetpack instead of her hidden wings.

When they reached the ground, Celestia supported Twilight. It was awkward having Twilight's wings brushing against hers invisibly, but ponies kept their distance a bit. They made it to the hospital, but Celestia refused to let the nurses take her and instead demanded to be led to the treatment room. The nurses obliged and led them.

“Right...I'm Nurse Read Heart...now you're going to tell me why you're so protective over this patient.” a nurse said, closing the door. “And why you have an illusion spell active.” she continued, looking up.

“They're the same thing.” Twilight said. She moved her hair out of her face to show her right side and dropped the illusions. Red's eyes widened and she took a step back, but she didn't freak out surprisingly.

“Holy shit...you weren't like that for your last physical...” Red said.

“Yeah well apparently when Demon Blood mixes with that drug they never told us about this happens.” Twilight sighed, cringing as she moved her leg. She hadn't realized how much it hurt until now.

“No, that's not how it works. That drug just enhances the senses. I developed it, I thought they would have told you...damn it...it just enhances your senses, like I said, like sharpens your eyesight and hearing and increases your reflexes...Twilight...what do you know about your parents?” Red heart asked.

“Um...my mother was a normal Canterlot Mage...my dad never had a history really, he just appeared one day and they fell in love, or so they tell me. That's all I know...though he did teach me and my brothers how to use magic.” Twilight explained.

“Twilight. The only explanation for what's happening is that one of your parents was in fact a demon. Your father is the most likely candidate.” Red heart said bluntly. Twilight looked at her for a few moments before sighing.

“So that's why they were assassinated...” she sighed.

“Wait...what?” Red asked.

“They were assassinated when I was little. Nobody knew why, I guess it was a demon hunter or something...can...can you tell me anything else about this weird transformation?” Twilight asked.

“Well...normally you'd be born like that, but your mother being a Mage she could have suppressed your demon blood. You said other Demon blood mixed with yours?” Red heart asked.

“Well yeah, I was practically drenched in it with a bunch of different wounds.” Twilight replied.

“Hm...I'm guessing high volumes like that then could awaken hidden bloodlines...” Red heart said.

“Wait, hold on...how are you so calm about all of this?” Twilight suddenly asked.

“Come to think of it, how did you know of the illusionary spell? You are no Mage.” Celestia asked. Red Heart grinned a little.

“There are a lot more of us than you'd think. We live in peace, half demons...even full demons. My mother was a Succubus.” Red heart said, her teeth sharpening and her tan eyes going red.

“Wait, so there are other kids like me around?” Twilight asked.

“Oh yes definitely, I just don't know them by name.” Red heart replied.

“Well then how come something like this hasn't happened to them?” Twilight asked.

“You have to understand...the kind of demons you're facing...they aren't the kinds we are. They're deadly. Those who get beat up enough normally don't live or even get solid hits in on their opponents. We've already got three casualties.” Red Heart explained.

“Oh...” Twilight said.

“Well...one thing I want to know right now is how that eye's doing.” Red heart said, leaning into her right eye, which was closed.

“Some accident with a cut off healing spell caused it to be imbued with magical sight.” Twilight said, opening it.

“Interesting...I know demons can sense magic...but outright see with it? Don't you need some sort of spell for that?” Red heart asked.

“Normally yes. I don't know how it happened.” Celestia said.

“Right, well...let's check on all your wounds, re-bandage them and get that leg a splint and crutches.” Red heart said, reverting back to her human look.

“Hey, I heard Twi got hurt pretty bad, is she here yet?” Dash asked when she burst into the living room of the manor to find everyone but Celestia and Twilight.

“Right here Dash.” Twilight called from behind. She came up to them in crutches, bandages around her abdomen and all down her arms as she hobbled up on crutches with Celestia in tow.

“Alright, what the hell happened?” Dash asked.

“Wait...did you just say you're a half demon?” Spike asked.

“Yeah...” Twilight replied, dropping the illusion once more.

“The fuck?!” Dash exclaimed.

“Ooh! Those are pretty!” Pinkie said, poking the horns.

“Well Darling...I...must say...you pull off that look well.” Rarity said. Fluttershy was the only one that seemed unphased.

“Oh good, I'm not the only one...” Fluttershy sighed. Suddenly she had small two inch long horns on her head and her wings turned from feathers to demonic.

“W-wait what?” the group yelped.

“Um...both my parents were half demon Valkyries...” Fluttershy said.

“...I never would have guessed...” Luna said.

“Wait, are there any other Demon kids we need to know about?” Applejack asked.

“No you're all normal, I think.” Twilight said.

“You think?” Dash deadpanned.

“Did any of you have a large amount of open wounds?” Celestia asked.

“I did, a bunch of scratches and small gashes...why?” Dash replied.

“Did you get any Demon blood on you?” Twilight asked.

“I ripped it's arms off and stabbed it with it, I was practically Drenched...” Dash replied.

“Were any of your parents Demons?” Fluttershy asked.

“I don't...think...so...wait...are you saying that's how you become half demon?” Dash asked, suddenly a bit worried.

“Not really, high amounts of demonic blood awaken hidden bloodlines. The fact you haven't changed says you must not be of demon heritage then.” Celestia said.

“Um...actually...it could take a few days...” Fluttershy said.

“Huh?” the group asked.

“Well...it normally happens soon, but it can take a while...my daddy said it took him three days to turn...” Fluttershy explained.

“Great...” Dash mumbled.

“Hey it's not that bad.” Twilight said.

“We're going to the higher ups after dinner, we'll get all of this sorted out.” Celestia said.

“Dinner sounds amazing right now...” Twilight said, rubbing her stomach.

“Right, well first you need to bathe.” Celestia said.

“I'll get dinner started.” Luna said.

“Oh! um...I wanna help.” Fluttershy said.

“I need a nap...” Dash said.

“I'll be in the dojo.” Rarity said.

“Ah'm gunna have ta join ya.” Applejack said.

“Hey Spike, Emerald, wanna play hide and seek?!” Pinkie exclaimed.

“I thought you'd never ask!” Spike exclaimed.