RWBY: The Unknown Sibling
(Harry is two years older than Ruby and three months older than Yang)

To the Anon who mentioned my timelines in ages. He is correct, Harry is the same age as Yang.

Ruby literally dragged Harry all the way back home. It was rather comical, a 4'11 fourteen-year-old dragging 5'10 sixteen-year-old by the arm. If you could imagine a dog on a retractable leash with a small child extending and retracting the leash whilst it is attached to a dog the size of say a Chihuahua it's an entertaining sight.

Yang was busting a gut watching the sight. Taiyang couldn't stop smirking, Qrow and Summer shook their heads "When is she going to remember you've got the keys?" Taiyang whispered to Qrow who snorted at that fact.

"Not for a while. I'll give it twenty minutes…Speaking of which how are we going to cram seven years of knowledge into one and a quarter?" Retorted Qrow getting a giggle from Summer.

"We all went to Signal correct…Save for you Qrow as you and your sister were taught in Atlas. The curriculum is practically the same and besides Hari's smart, if we give him the equations and some basic questions he can go from there and as for teaching him a weapon…We'll teach him how to use a scythe and a blade."

"Ruby…Do you have a key to get in?" Harry asked his hyperactive sister.

Ruby blanched and almost face vaulted "Nope…Tend to walk slower but the fact you came, with mom. Well I kind of…" Ruby trailed off and Harry snickered before running his hand through his hair similar to what her Uncle…no her Dad did.

"So what do we do?" She asked curiously. Harry chuckled and observed a few sturdy looking trees around the house.

"Watch this…" Ruby watched as Harry walked up to one of the trees, placed his foot on it and stretched. He took five steps backwards and charged forward and Ruby's eyes widened he RAN UP the vertical tree trunk before jumping off and grabbing one of the thicker branches and sat down.

"That was awesome…Let me see if I've…" Ruby darted forward and almost vanished from sight which caught Harry off guard. There was a CLUNK and a whimper and Ruby appeared staggering away from the tree trunk clutching her head.

"You went to fast and didn't focus on where you wanted your feet in five paces time. Now come here and get your hand up as high as you can." Harry instructed and with one hand grasped Ruby's hand "Now plant your feet on the tree and slowly walk up."

This was the seen Yang, Summer, Qrow and Taiyang observed when they arrived. Both Branwen siblings in a tree, having a giggle. Or rather Ruby was as Harry tried to access his semblance and conjure a fireball into his palm. "How's it going?" Qrow shouted, Ruby landed on her feet as she jumped out of the tree, Harry yelped and literally off the branch, fire erupting into his hands and he launched it at the tree. Harry managed to land in a crouch.

"Sorry…" Harry said as the tree burst into flames. "You created it, you can clear it up…If you know how." Harry nodded "If fire emerges when I'm happy or sad, then water must come about if I'm feeling calm." Harry calmed himself down and reached out for the dust that permeated in the air and absorbed it, he drew his fist into his hip and thrust it forwards as if he was shoving someone away and a torrent of water rushed out dousing the tree.

"You're like your mother kid…Instinctive grasp on your semblance anyways we need to chat about how we are going to catch you up with Yang before sending you to Beacon." Explained Taiyang.

Harry groaned at that thought "How similar are the curriculums from I used to live to here mum?"

"Pretty much the same aside from History, Geography, PE and Science…What are…oh I see."

Harry smirked "I home study myself on Maths, English, Religions and go in for those lessons."

"But still that doesn't mean you're going to graduate in time."

Harry chuckled "Uncle, please have some faith…I've done worse. Learnt how to telekinetically summon something some four hours before being thrown into a death game…Anyhow, let's go and get some food."

This was seconded by Ruby's stomach rumbling "Sorry…" Harry chuckled and poked her forehead "That sounded similar to a friend of mines…Could eat for the world or at least the country."

Taiyang let them into the house, Ruby jumped out of the tree vanished into petals and re-emerged next to her parents. "The heck?"

Ruby giggled "I can run super, super, super fast." Harry chuckled "Just make sure you don't break the Sound Barrier and Space/Time Barriers little speedster."

Ruby cocked her head "Basically if you run really, really fast and once you reach a certain speed you'll a boom…"

"Bit like one of Atlas's fighter jets?" Harry nodded "…That's the sound barrier. Once you hit the sound barrier and you keep going faster you eventually start hitting Mach speeds. They are x number times the speed of sound. So Mach 2 is…"

Ruby's eyes widened "Twice the Speed of Sound and the Space/Time barriers are barriers that allow me to effectively time travel…What would happen if I hit someone at those speeds?"

Harry paled "Honestly, not a clue apart from the target being vaporised. It's part of a Theory…."

"Theory of Relativity, I know the theory we are studying it at school in simple terms…Come on Harry, I have Uncle, Dad and Yang lecturing me about schoolwork and doing it. I don't need another, besides I'm hungry."

Summer took Harry up three flights of stairs to a rather simple and empty loft space. Empty in one room and in the other one wardrobe, chair and a bed "You'll need to go downstairs to use the bathroom. Taiyang and I are on the second floor as is Qrow. The girls are on the floor below you so you'll have to share."

Harry gulped "They don't spend all the time in the shower do they? We do have a large hot water supply?"

Summer giggled "I really don't know. I really do not know." Before she left she hugged her son who gratefully returned it.

"Mum, can you catch me in about thirty seconds." Harry placed his shrunken bags on the bed and withdrew his wand and concentrated. Soon enough the bags were restored to their natural size and Harry sank to his knees sweat running off him.

"You okay?"

Harry grunted "Adjusting to having next to no magical power but more aura than most. Let me have a shower, get changed and then let's get food."

Harry groaned as the hot water rolled over his body, it felt so good. If he ever went back. He made a mental note to deal with the Dursley's in some way shape or form. He wondered idly how his whale of a cousin would stand against a Beowulf or an Ursa. Harry pulled on some jeans, boots and a shirt before clattering down the stairs tripping over a corgi at the bottom of the stairs "What the…"

Qrow chuckled "That's Zwei…Tai trained him to look after Ruby and Yang to protect them from boys." Harry snarled inwardly "Uncle's going to be protecting the dog soon if it does not stop licking me…Anyway, dad is it possible for you to train me how to use the weapon you use."

Qrow nodded "I'd love to kid. Now that we've all made it down let's get food." The place Qrow took them to was a Meat house buffet. "I found this place a couple of weeks ago and they do some good strawberry desserts." Ruby was already compliant, Harry nodded and his stomach growled.

They entered to find a family harassing one of the staff who happened to be sporting a tail "Who are the family harassing?" Harry asked out the side of his mouth "Before you say staff, I'll clip you around the head Ruby…Yang."

"A Faunus. Human's with night vision and other things at the cost of having a tail."

Harry cracked his knuckles in thought as he roughly calculated the worth of kicking the crap out of the family. They didn't look like a Hunter family so he had a chance, he doubted their aura's were unlocked. Summer caught the look in her son's eyes "Don't…Unfortunately you're going to have to suck this one up."

However, one of the children looked up and saw Harry, his eyes widened and whispered something and they stopped tormenting the Faunus. "Harry, what did you do?" Asked Ruby curiously.

"What makes you think that I did?"

"One of them saw you and the look of terror."

"Oh that…That must be the Lark family…This should be interesting." Harry said at the family paid up and made their way over. "Can I help you?" Asked Taiyang curiously, he wasn't paying too much attention to his step son but knew he had done something.

"You…Yeah you with messed up eyes." Demanded who could only be Senior Lark.

Harry immediately pointed around before pointing at himself (Season 3: Brawl in a Family). The man's eyes narrowed "Oh you think you're being cute and funny?"

Summer went to open her mouth but Harry beat her to it "Bitch, I'm adorable and hysterical. Look at my sister." Said Sister was trembling with laughter as were Qrow and Tai although the latter was trying not show it but the corners of his mouth were twitched upwards.

The man bristled "The name is Magner."

"Magner…Lark? Is your family this prentious normally or are you the exception, now what seems to be your side of beef with me? For I know you not and know not for what I have done." When in doubt act cryptic, give them more rope to hang themselves with.

At that particular moment Ozpin entered, he had evidently entered missed something because the whole restaurant was quiet. "You, you manhandled my son like some heathen. You also manhandled my son's friends with no regard to their station in society."

Harry cocked his head innocently "Society? Mein Freund, how can I know of the society when I have not even been here a day." Harry responded putting on a thick German accent which sounded very similar to upper class Atlas families.

That was the last straw for Magner "That's it if no-one in your family is going to discipline you running your mouth to your elders' than I'll do it for them."

Harry snorted "Running my mouth? Asshole? You pretentious son of a whore and a man who cannot please his own wife and quite probably does the same. Yes, I'm running my mouth because we are having what is called a conversation. Evidently you don't like it when your wife or anyone talks back to you because you are so addicted to your own voice. If you're going to discipline better make it a good shot because I'll be extracting your balls through your mouth and spine through your ass. That's just for abusing the Faunus staff member."

With that Harry left the restaurant with Magner following and the man's family. Summer checked her scroll to see a message 'Don't worry about the disturbance in the floor. Just him feeling oblivion.'

They felt it at first someone had evidently flared their aura in a pissing contest "That's what you get for messing with one of the best Hunters coming out of Atlas."

"That's adorable…Now try mine." The ground began to shake, the walls began to rattle and any sauce and liquids in small droplets began to rise. Then they heard something it sounded like the chirping of birds followed by a sound that can only resemble a branded pig before Harry walked into the restaurant.

"Sorry about the disturbance…He's alive slightly burnt and appreciating the feeling of honesty." Harry slid onto the seat next to Summer. Or rather now Ruby as the girl vanished and appeared next to him "That was so cool! How did you do that! I mean we felt your aura! No-one's been able to do that."

Harry snorted "It's less people have been able to more on the lines of not wanting to admit that people bullshit about their power. You'll find Ruby that I'm more than willing to call people out…Anyway let's eat."

Everyone jumped up to grab their orders from the BBQ pit, Harry had grabbed several ribs and two burgers along with two baps, two small bowls of cheese and salads. "How can you eat that much?" Asked Yang as Harry effortlessly devoured everything on his plate.

"What you guys know about metabolic rates?"

Ruby shrugged Yang nodded "That's how quickly food is broken down in your body right?"

Harry nodded "My metabolism is about twice as effective as a normal persons meaning I need to eat more food to actually gain weight that sort of thing and that is why Yang, I can eat so damn much."

The meal finished and everybody headed back home. Harry was filled with nervous energy at the expectations of the morning. The morning dawned bright and early, but Harry wasn't asleep, he had awoken just before sunrise and stepped out onto the small balcony built on the outside of the house in front of his window. "Hey kid…Thought you'd be asleep?"

Harry grinned as his dad joined him "Ready to train me?" Qrow grinned and handed him a wooden version of his standard sword "Rule 1, never pick a bade that you like the look of. Choose one that FEELS right. Rule 2, don't worry about design that comes later. Rule 3, treat it with respect."

Soon enough the pair were going through kata's and sparring with what Harry had picked up. They stopped for breakfast where Ruby and Summer were cracking eggs and frying bacon "How's he doing?"

Qrow grinned "He's a natural genius…Three maybe four months of continuous practise and he'll be on par with a Beacon Undergrad."

(This is just shy of seven months before First Episode).