Supermerwholock One Shots

Johnlock X Reader - Aunt Eurus

(s/n) ~ strange first name.
You were an adopted child. Your biological parents hadn't wanted you, so you were given to a new family. You weren't complaining, you had never met your birth parents. So, you grew up, in the middle of London, with your two fathers, - yes, two fathers - in their apartment, 221B.
You grew up with them disappearing for days on end. But, every time they had to leave, they always brought you a gift back. They gave you a classically female middle name, but your first name wasn't so original. So, as you grew older, you started to refer to yourself only by your middle name.
It almost broke your father, Sherlock's, heart when you first started to do this. Though, better than anyone else, he understood why you did this. Sherlock had been his middle name. He had started using it to be more like his older brother, your uncle Mycroft.
You were eight when Sherlock discovered his sister, Eurus. He had been teaching you violin since you were five, for reasons unknown to you. You really enjoyed it and were becoming an expert by the time you turned eight. After he'd visited Eurus a couple of times, he took you to meet your aunt.
He hadn't told you where you were going, but he'd told you to take your violin. When you saw her, her back to you, violin in her hands, being played masterfully, you were inspired. Both you and your father took out your violins and started to play the same piece as her. She turned. When she saw Sherlock, she smiled. When she saw you, she was confused.
When the three of you had finished playing, Sherlock introduced you to your aunt - and your aunt to you.
"Eurus," he began, looking at the woman in front of you. She looked up at your father. "This is (s/n) (y/n) Holmes, your niece. She prefers (y/n), for some reason."
She turned to face you. She looked you up and down, then said: "Hello, (y/n), I'm your aunty Eurus. You play very well." She indicated to your violin.
"I'm nowhere near good enough yet. I haven't even been taught everything," you replied, matter-of-factly. Your aunt smiled. "Have you met my father?"
"(Y/n)," Sherlock warned.
"Do you mean John Watson, honey?" she asked. You nodded.
"Eurus," your father warned her.
"Have you not told her?"
"Told me what?" you asked at the same time as your dad went:
"No. Eurus, don't you dare."
You turned to your dad. "Tell me what?"
"I'll tell you later," he mumbled, glaring at Eurus angrily.
"Well, whatever it is, it's got you scared. You started acting like this when I asked about dad, so it's to do with him. You seem to be annoyed with aunt Eurus, so I guess that she was involved," you looked up to him.
He seemed properly scared by that point. "(y/n)," he whispered.
"Did aunt Eurus try to kill dad?" Behind you, Eurus smiled.
"(y/n), let's discuss this when we get home," Sherlock seemed terrified, now.

A/N~ Hey, I'm trying to work on a depressing doctor x reader for in the future, but I have no ideas. If any of you have any, feel free to message them to me. I'd love to hear your ideas!