Basically the story of Nymphadora Tonks... In my way. Twists, and change of plot, all that. You better prepare for something ssoooo weird :D

"Love is a game two can play and both win."
-Eva Gabor

"Being deeply loved by someone gives you strength, while loving someone deeply gives you courage."
-Lao Tzu

1. Sirius faked pout

"Dora! Your cousin's here!" her mother yelled from behind her door.
"OK mom, he can come in!" Dora answered. And soon her door opened, this 6-year-old's favorite cousin walking in - with another 19-year-old boy.
"Sorry Dora, I have no time to stay for long, I need to go see Prongs - you remember James, don't you?" Sirius asked, smiling happily at Dora's confused expression, as she looked at the stranger.
"Yeah, I do remember Jamie..." Sirius chuckled at the nickname Dora had given to his best mate. "But you were gonna 'babysit' me, as mom and dad says I can't be left alone!" Dora's slightly disappointed tone made Sirius' smile fade.
"I'm reeaally sorry, Dora, but I just have to go. And that's why Remus is here!" Sirius beamed, and the other guy stepped forward. "You have seen him before. You were just so little, you can't remember. And don't worry, I'll be back before your parents."
"Ok then... Do you have to go right now?"
"I'm afraid I do", Sirius answered. "But hey, have a nice day with Remus, yo baby cousin!" He turned at her door to give her a slight wink. She waved at him. Then the door was closed behind little Dora's favorite cousin, and she was left with this Remus guy.
"You're his friend, now, aren't you?" Dora asked him, frowning. Remus thought he knew someone else who talked like that, but couldn't quite catch up, who.
"Yeah. And you're his cousin, now, aren't you?" he mocked her with a slight smile.
"Yeah. Your name's Remus, now, isn't it?" she giggled.
"Yeah. People call you Dora, now, don't they?" They continued like that a while, until Dora didn't answer his question, but just cocked her head to the side and smiled at him.
"I like you. You're not like Jamie-Pamie", she laughed. "You're funny. He didn't like me."
"Now, young lady, I like you too", he said, smiling back at her, sitting next to her on her bed. Dora straightened her head and frowned.
"What's wrong?" Remus asked. Dora looked at him.
"You know what? I'm actually a bit hungry", she said. "And tired."
"Well, let's go get you something to eat, and then you can go to bed, right?"
"I'm not sleepy. Just tired", Dora corrected. "I've played wizard's chess with dad, wanna try against me?"
"Sure! But first things first, come on now". Remus smiled at her. She jumped up and let him go first. Unfortunately, she tripped on his dad's broomstick when she walked through the living room.
"Ouch!" she yelped, as she fell to the floor, her hair changing color to light brown instead of bubblegum pink.
"Are you all right, Dora?" Remus asked, turning to help her up.
"Yeah. My ankle hurts a bit, but it's OK. I'm used to this. I thought Sirius warned you imma bit clumsy", Dora babbled. "Specially when dad leaves his broomstick laying about like this..." She turned around to face the broomstick, and scolded it for laying on the floor.
"Yeah, it happens", Remus chuckled at her furious talk at the broomstick. "Dora, you know it can't hear you, now, don't you?"
"Of course it hears me!" Dora disagreed, turning back to look at Remus. Then she grinned, with a face that told she was winning this. "Different thing is, that it doesn't understand! Or do you, you big fat broomstick?" She kicked the broomstick lightly, and as a reply, it rolled on the floor a little, further away from Dora. "See, Remus?"
"Hey, don't talk like that! if it hears you, it might get hurt! Remus winked at her, turning around and walking to the kitchen. He had been in this house many times with Sirius, even alone as a housekeeper when the Tonks' were away. But now, the case was different. Usually there was not a little girl tripping over things, talking, laughing, running, even crying a bit, and, above all, being so damn adorable all the time.
After Dora and Remus had played three rounds of wizard's chess(Dora won two of them), talked about thing(like names, and Dora found out his middle name was John, and started calling him Johnny) she was sitting on the couch, a frown on her little forehead, thinking.
"Now, I'm gonna get worried if you're not telling what is so serious?" Remus sat down next to her after he cleaned up all the mess that the wizard's chess has put up in the living room.
"I haven't told mom. Or dad. Only Sirius knows. If mom gets angry...?" Dora muttered quietly.
"Haven't told what?" Remus asked.
"That I can do this", Dora looked up at Remus with wide eyes. Remus heard a crashing noise, and turned to look what was it. The wizard's chess board lied on the floor, broken pieces all around it. Before Remus could make a sound, the board and all the pieces rose hanging in the air and it repaired itself, settling then back down at the table.
"I made it by mistake when I played with Sirius, and won for the first time - genuinely, I mean. When nobody let me win", Dora explained. "And, oh! You just gotta see what else I can do! Come on, now, Johnny!" She jumped up and ran to the entry, putting on her boots. Remus walked after her and put on his shoes, too. Dora dragged him to the backyard. It had one pair of swings, flowery hedge and a summerhouse. Dora ran to the swing, and with one hard kick, she put up a fast speed.
"See, and that's not all!" Dora exclaimed. She jumped. Remus exclaimed, worried she might fall down and hurt herself.
"Don't worry", her laughing voice said. She sort of slowed in the air, flying through the air. She even changed course, and then landed -very uncharacteristically to her- on her feet right in front of him.
"See? Sirius said this isn't usual for my age. I can do many things other six years olds couldn't do. And I'm so very worried", Dora said, looking concerned. Remus crouched down to get to eye level with her. He looked her in the eyes, and she looked back.
"Dora, this is nothing to worry about. You're just more powerful than others. But please, for your own sake, try to control it as best as you can", he stated.
"You know, if I didn't know better, I'd say you were my lost brother", Dora smiled, wrapping her short arms tightly around his neck. He smiled, getting up and keeping her in his arms.
"Yeah, my little sister", he whispered in her hair.
"Remus? Dora? Where are you?" Sirius yelled from the entry.
"Backyard!" Dora screamed at him. Sirius ran out to see Remus put Dora back down.
"Dora, everything OK? Was Remus a good babysitter? Had fun?" Sirius asked, hugging Dora quickly.
"Yes! He's... He's like a brother. Only bad thing that happened was when I tripped over daddy's broomstick. But it's OK. Oh, and Sirius!" Dora exclaimed at the end, looking up at her cousin.
"Oh no... you showed him, now, didn't you?" Of course! It was Sirius who always spoke like that! Remus rolled his eyes at his own stupidity. Sirius and Dora were cousins and Sirius was so much older, of course Dora would talk bit like him!
"Of course I did! Mom doesn't know, or dad, though", Dora shrugged.
"It's not bad thing! Just try and control it, Dora", Sirius sighed.
"Johnny's definitely nicer than you", Dora huffed.
"Johnny? A new nickname?" Sirius turned to Remus, now grinning.
"Obviously", Remus shrugged, grinning too.
"OK, Dora, d'you want him to keep company to you since now on, instead of me?" Sirius asked. Dora nodded.
"No offense, though, Sirius, you're still my best cuzin!" Dora winked.
"None taken. Well, some kind of is, he replaced me as your personal babysitter!" Sirius faked pout.