A/N This is only my second ever fanfic, was the first one wasn't very good. oUr was on a similar theme, but... well, I hope this one's better.

I knew it, since the moment he was born. I knew there was something not right with us. For the first seven years of my life, it was just me. No one understood. Then my little brother was born. He sees the world through the same eyes as I do. Granted, he doesn't possess the abilities to quite the same level as I do, but he has more energy and never seems to lack motivation, once he's interested. Unfortunately, he doesn't seem to understand how similar we are. Well, he hasn't before, but now... now I know. Now I can tell him the truth, the truth that's been hidden from the two of us by our mother, the truth... of who our father is.

I looked out of the window. Bad idea. My brain immediately began to try to process the huge amounts of information that was sent towards it by my eyes, greedily drinking in the outside world that hadn't been seen by them for- how long? 24,48,72,84,87- 87 hours. Sitting in a room in the dark is underrated. I enjoyed the silence. It was interrupted a few times by Mycroft and Mother bringing me food and water- food, water? Who needs them? Boring- but mostly I wasleft to myself, the way I like it.
Now though, it seems, Mycroft has something important to tell me. And this time, it actually is. important, not like last time, when he interrupted me just to say that Nana died. This time, it matters. His left index finger is shaking. The only time it's ever done that before was one he told me I had High Functioning Autism, which isn't true. But he thinks it is.
"Sherlock", he is saying. I should probably listen to him, now I've determined how important it is. Maybe... maybe... I don't know. I have no idea what could be so important. That's not good. Have I lost a room somewhere? No, I don't think so...
"Sherlock!" He's physically shaking me now. That's unpleasant. I dislike being touched. He sounds very impatient. He's only fifteen, he shouldn't be trying to act like a father to me. Father. Father! Of course! That's it! It's something about our father!

I hope it's interesting.