Disclamer: I do not own Sherlock and Harry Potter. I do own, however, some OCs.

Sherlock pushed his trolley covered in a jumbled stack of suitcases and some odd-looking items including a cauldron forwards. In any other train station, this would be very unusual, but at King's Cross Station, it was considered the norm, especially during the end of summer. Many kids would swarm the station, each one almost always having a trolley stacked with suitcases, books, and extremely unusual objects one will never, ever see outside of King 's Cross, and occasionally, a few might have a cat or an owl with them.

Rolling his trolley up behind his little brother, Mycroft not-so-innocently asked, "Are you nervous, brother?"

With a smirk and a quick, "Never," Sherlock casually walked right up to the barrier (which was odd for most first years, for it was much more likely for them to charge) and simply waltzed through the barrier that really wasn't as solid as it appeared, and he was shortly followed by Mycroft.

The brothers now stood at a place that for one ment new beginnings, while for the other, it ment new opportunities. They stood in none other than platform nine and three-quarters. Sherlock, once again unlike the majority of first years, looked bored by it all.

Mycroft gave some excuse involving the fact he was Head Boy for Ravenclaw, and left Sherlock to find his own place to sit. The sociopath sighed and went to the very back, and sat on the only empty booth left on the train. He just hoped no other first years were running late. Sherlock sighed again and took out one of his new textbooks; One Thousand Magical Herbs and Fungi. He had already read the spellbooks from cover to cover, along with other textbooks he "borrowed" from Mycroft, but he had only gotten through half of Herbs and Fungi. It was actually really interesting, mostly because it gave him more ideas for experiments.

Sherlock was quite into the book when someone came into the cabin, ruining Sherlock's hopes to sit alone. But at least now, he had someone to analyze. Grew up with a family of wizards. Has an older brother and a younger sister. Although he came from a wizard family, he knows how to look like a muggle, so maybe parents have history with muggles. He is well off, because his family is rich, probably have enough money to last several lifetimes, but are careful with spending it. First year, nervous he will disappoint family with house he gets into.

All of that had gone through Sherlock's head in the space of time it took the newcomer to walk three steps. With an awkward smile, he said, "Uh, hi. I'm Albus. The rest of the cabins are full, do you mind if I sit here?"

Sherlock rolled his eyes and said, "Yes, I do mind, but I am assuming you will sit here anyways if the rest of the cabins are full. So fine, sit."

Albums grinned and said, "Brilliant."

Albums hadn't even sat down when two more people burst in. Sherlock sighed and thought, oh great. Now even more people are coming back here. I'm never going to finish this book.

The girl was from a family not as rich as Albus's, but not dirt poor either. Also comes from a fully wizard family, also with some experience with muggles. She knows Albus, families most likely friends, or the met outside the train, but that was unlikely because they seemed to be close friends. The girl is also nervous about sorting, but has no older siblings, even though she wasn't an only child. Worries about sorting because of stories Albus's older brother told her, also proving families are friends.

The guy was muggle-born, and had a younger brother. Obviously amazed by magic and has a caring family. Younger brother happy for him, and wants to keep in touch, even though he doesn't plan to considering he doesn't know how to communicate to the muggle world. His family comes from a military background, his father probably was in the army.

Instantly confirming about half of his prediction, the girl waved and said, "Hi, Albus!" She sat down next to him and held out her hand to Sherlock. She said cheekily, "Hiya! I'm Rose. Rose Weasley. Who are you? Oh, you're reading the books early, too? I think these are really interesting. My parents have always said that knowledge is important. I was planning on studying up on spells first, though, but herbs and Fungi are interesting too, I guess."

Without looking up from the book, the genius said, "Sherlock. I've already read all of the spellbooks." He made no attempt to shake Ross's hand.

Rose awkwardly pulled her hand back and the boy equally awkwardly slipped into the booth next to Sherlock. Glancing from person to person, he decided that his theories needed to be proven or denied, or else it would drive him crazy.

First, he looked directly at Albus and said, "Your family has a long history with magic. I'd say pureblood, but you have muggle a bit farther back. I'd say one parent either was a muggleborn or a half-blood. You have an older brother and a younger sister. Your older brother told you stories about the sorting, and he made you nervous, even though it's obvious that you're going to be Gryffindor. Your family has quite a lot of money, but careful how they spend it."

From Albus, he moved on to Rose. "Your family, however is not as well off, but don't accept charity, but Albus's family forces them to take some of their money, for they have too much to know what to due with it all. Like Albus, you have one parent who is either a juggler or a half-hour. Your family and Albus's family are close friends, which is why you and Albus know each other. You have a cat. You are also nervous about the sorting, because either Albus's older brother told stories about it, or your parents teased you about it, or maybe both."

Finally, Sherlock turned to the first year who had sat down next to him and said, "Muggleborn. You have a caring family, who were really proud when you got the letter. It was a big surprise to them. Your father used to be in the army, and told you stories about it. Your younger brother, Harry, misses you and wants you to keep in touch, but due to your lack of knowledge of intercomunications between Muggles and wizards, it might not happen for a while."

He looked around at all three and asked, "So? Was I wrong?"

Albus made a face and said, "Er, no, mostly. My dad grew up with muggles, but he had two wizard parents."

Rose also looked slightly confused and said, "I have a little brother..."

The other boy, the one who Sherlock still didn't know his name, looked awestruck, a much different reaction from most others, and said, "Close. Harry's short for Harriet."

Sherlock slumped in his seat and exclaimed, "Sister! Always something."

The boy continued to stare at Sherlock in awe as he said, "How... How did you do that?"

Sherlock narrowed his eyes and replied with a smug, "Isn't it obvious?"

Rose rolled her eyes and said, "No, it's not obvious."

Sherlock sighed and said, "Alright, fine. Albus, you seem really comfortable with magic, and the fact that you have a moving picture of you and your family confirms that both of your parents were wizards, since both have wands in the picture. Your apparel suggests differently, because your clothes are muggle, and actually would look normal around other muggles, unlike most wizards who just throw something on and end up looking way out of place. Although it would have been easy to just give you your older brother's old things, but instead you have everything new, brand new, and you have an expensive-looking owl, all of which suggests a wealthy family. As for the Gryffindor thing, it was a bit of a shot in the dark. You hold yourself like most Gryfindors, and though I have only known you for less than half an hour, everything about you shouts 'Gryffindor.'

"Rose, your things, however, is old and used; not hand-me-down, but second hand. That suggests both you do not have an older sibling and that your parents are not too wealthy. It is obvious that your family is friends with Albus's, because you instantly recognized him; also, I saw your parents talking when coming onto the train. As your families know each other, and Albus's family being fairly wealthy, Albus's parents would most likely insist on giving your parents money. Like Albus, you dress similar to a muggle, but you have several moving pictures, which shows that you are not muggleborn.

"And you. You are dressed like a muggle, like anyone who really knows one would, but your face betrays your amazement of the situation. Also, you have a comic book with immobile pictures, so it's a muggle comic book. A wizard-raised student wouldn't have one. You have a note on one of the suitcases that clearly says 'Keep in touch,' and it's signed by Harry. The way you hold yourself suggests military background, and since you are much too young to have been in the army, I'm assuming your father was in the army, and you take after him."

The currently nameless first-year stared at Sherlock and said, "That's brilliant. Just brilliant."

"That's different to the usual reaction."

"What's the usual reaction?"

"'Piss off.'"

A majority of the rest of the trip was spent in silence. At least, until they got a new visitor.

A group of other first years burst into the cabin. Sherlock put down his book, and Albus woke up. The one in the middle, obviously the leader, smirked and said, "Looks like we found the freak."

Sherlock rolled his eyes and greeted dryly, "Hello, Anderson. I guess your anger management classes haven't worked."

Anderson glared at Sherlock before addressing the rest of the first-years, "What are you doing back here with the Freak? He's a psychopath, probably a murderer."

Sherlock snorted and said, "How many times do I have to tell you? I'm not a psychopath, I'm a high functioning sociopath. And I'm not a murderer. Or is it too complicated to get through your extremely thick skull?"

Anderson growled and said, "Oh, shut up, Freak."

Rose, in a rage, stood up and pointed her wand at Anderson. Anderson just rolled his eyes and swaggered up to the booth, shoving the muggleborn student out of the way and dragged Sherlock out of the booth, holding him by the color. Rose muttered something, but the spell failed, because it just made a loud bang, and didn't do anything.

Sherlock attempted to punch Anderson, but one of his grunts pulled his hands behind his back. Anderson pulled his fist pack, and threw it forwards, and it landed with a crack on Sherlock's face. His nose was on fire, most likely broken. The other three first years where trying to get Anderson away from Sherlock, but the kid was surprisingly strong. His fist drew back, preparing for another punch...

"Stupify!"

Anderson fell to the ground, and the grunt quickly let Sherlock go. Mycroft had burst into the cabin and cursed his little brother's attacker.

Mycroft sighed and said, "It's the beginning of the year, and you've already gotten yourself in trouble." He shifted his gaze from Sherlock to Anderson, and said, "You will be getting detention for attacking a student, Anderson, and so will your friends."

Anderson stood up and glared at Sherlock. He said quietly, "Watch out, Freak. Your big brother won't always be there to save you."

And with that, Anderson stalked out of the cabin, quickly followed by his henchmen. Mycroft hardly gave Sherlock and his broken nose a second look before walking out after Anderson.

Sherlock turned to Rose and commented, with a tissue he had taken out of his pocket held to his broken nose, "Wah da an awerting spewll?"

Rose nodded, and Sherlock smirked. Rose sighed and said, "You should get that looked at when we get to school." Sherlock nodded slightly and collapsed in his seat, the other three sitting down soon after.

Albus piped up and asked, "So, have you known Anderson long?" Sherlock once again nodded and said, "Yah. Andewson liwbed a few 'ouses 'own. He weally diswikes me."

The short blond student grinned and said, "Oh, really? I didn't notice."

Surprisingly, Sherlock snorted in laughter. He grinned, and finally asked, "By da way, was yowr name?"

The blond grinned and said, "Watson. John Watson."

And little did they know, but the attack by Anderson would be the start of a beautiful friendship.