Now I have a... older sister?
Sister!Fem!Reader and !BigBro Riddle Rosehearts/ !BigBro Malleus Draconia /!BigBro Silver Vanrouge.
Pairing: None .
Note: [Y/n] will be used to refer to the reader. I originally posted this in Spanish, and English isn't my native language, so I'm using a translator to translate it.
THERE IS NO ROMANTIC RELATIONSHIP IN THIS!! The reader and the character ARE FAMILY!
𝑴𝒚 𝒎𝒂𝒔𝒕𝒆𝒓𝒍𝒊𝒔𝒕
Being the youngest daughter of the family of mages you belonged to was quite important. You were expected to maintain the status your older brother had earned through great effort at Night Raven College, and in moments like this…
In moments like these, it was when [Y/n] wondered what she was going to do to remain at the academy and become a great sorceress like her brother was close to achieving—if she couldn’t even finish the stupid potion Professor Crewel had assigned as her final project.
She slammed her head against the desk, ignoring the fact that she had knocked over a bunch of spices, scattering them everywhere.
Was it hard? In theory, no. The professor had left the step-by-step instructions on the sheet now taped to the wall in front of her. And maybe she wouldn’t be in trouble now if she hadn’t spent the entire class doodling in her notebook and daydreaming about her husband from the last anime she watched.
She hit her head again. Her brother would kill her if he knew she was wasting time instead of paying attention.
"[Y/n], are you in there?"
And, as if it were a fanfic full of random stuff, a knock on the door echoed through the room, followed by the voice of the last person she wanted to see at that moment. Her older brother was at the door asking if she needed anything, since no one in his dorm had gotten a response from his sister all afternoon.
"I'm coming!"
Quickly and clumsily, she swept everything spilled on the desk into the trash can, including previous failed attempts she had left aside. Mixed perfectly in the hurried motions of a desperate girl trying to clean, she failed to notice one of the glass bottles breaking, cutting her finger and spilling blood.
The potion changed from green to purple the moment she hid the trash can behind the door.
Trying to steady her breath and wearing the least-fake smile she could manage, she opened the door. And honestly, everything could have gone well… but the randomly altered potion exploded at that exact moment, creating a smoke bomb that filled the room.
Both siblings began coughing as they scrambled to open the windows and door, and once the smoke cleared… there was nothing left but a girl who looked exactly like your older brother.
The next morning, both of them were in Professor Crewel’s office. Word of the incident had spread quickly, and the two… sisters? sat in front of his desk.
"Doing this was harder than your project, [Y/n]."
Professor Crewel spoke while inspecting the list of materials the poor girl had bought. "By mixing your blood, you managed to create a shapeshifting potion in the most rudimentary way… Such a good puppy!"
"But… will I be normal again?"
The girl’s eyes were full of tears as she looked at her brother—arms crossed—who hadn’t said a word.
"It’s temporary."
The professor spoke with pride; no other student had ever achieved something like this in his class. You would definitely be exempt from this school year. "You just have to wait until the effects wear off… Three days should be enough."
And with a nod, they left. Three days was less than you expected…
But long enough for a boy to fall hopelessly in love with your now older sister.
Riddle
♡ Your now older sister had caught the attention of a third-year boy from the Lion dorm. So now he trailed behind the two of you all day, threatening anyone who got close to his girl and her sister.
♡ You obviously couldn’t hold back your laughter when Riddle—now Rielle—turned into an angry tomato upon learning about such a stubborn boy. Even though the situation had been explained to him, he refused to believe it and refused to leave his love’s side… Another burst of laughter filled the classroom.
♡ Your brother reached his breaking point, a vein popping on his forehead since he couldn’t stand dealing with such behavior—and now had to endure the boy’s sweaty arm over his shoulders.
♡ "OFF WITH YOUR HEAD!" And that was enough for the boy to back off from Rielle… well, that and the director personally calling him in after a talk with your brother.
♡ Now you had an even more overprotective older brother. He hadn’t realized how intense boys could be. Once he returned to normal, he planned to set strict parameters for anyone who dared try to date you in the future.
Malleus
♡ Your brother—now going by Mallory to avoid attention and embarrassment—hadn’t shown the slightest interest in the boy from the Underworld dorm. Not on purpose… He was simply a bit absentminded at times.
♡ It took a few hours before the boy gathered the courage to approach your brother, as he had fallen for Mallory’s serious expression and his horns… To which Malleus merely thanked him, turned elegantly, and walked away.
♡ You weren’t sure what happened, but it seemed to only make the boy fall harder. He found all your social media accounts and messaged you at midnight, wanting to know everything about you, sister, because no matter how much he searched, he couldn’t find anything about her. And that… scared you.
♡ Of course, you told Mallory, who calmly said to keep cool—he would handle it. No one scares his sister, and no one gets smart with his family.
♡ And that’s how Malleus not only broke a heart, but also traumatized the poor boy.
Silver
♡ Silvia… You all didn’t have much imagination for changing his name, honestly. But hey, at least it wouldn’t stand out.
♡ Either the students were really clueless, or they genuinely believed Lilia had adopted three children years ago—only the prettiest sister had been kept secret, or so claimed a Pomefiore boy who couldn’t stop gazing lovingly at Silvia from the moment Silver turned into a girl.
♡ As for your brother… Well, he didn’t care. He stayed in his own world, sleeping beside you. But you were very annoyed by that idiot constantly asking to join you under the school tree, trying to get Silvia to rest her head on his shoulder.
♡ You told Lilia, who giggled at first, but once he heard that his baby [Y/n] had been called the ugly sister, he went to have a very serious talk with that boy. No one talks to his chicks that way.
♡ And when Silver returned to normal… well, he was told what happened, since he hadn’t been aware of much.
