A/N: This the last Black child. I'm sad to see it end so soon because I like writing about the young!Blacks. I'll be sure to write more fics like this in the future. But for this last one, we see a day in the life of 7-year-old Regulus, living with his 8-year-old prankster brother Sirius. I imagine Regulus would always look up to his brother. Even when Sirius turned 'bad', Regulus would still have some secret wish to be just like him. And I like how everyone of these, except the Sirius chapter, stars Bella some how. She's my favourite villain you just love to hate. RxR. FxF.

Disclaimer: I do not own Harry Potter.

His big brother was just so cool. Sirius was so brave, so confident, so unafraid. So not Regulus. Sirius would take risks and Sirius would pull pranks on their mum, their cousins, their aunt, never their dad. Sirius was who Regulus wanted to be.

Regulus was not Sirius. Regulus was too scared to break the rules. Regulus couldn't think up cool pranks like Sirius. Regulus was not as fast as Sirius in case he had to run away from the scene of the crime. Regulus was a loser.

Regulus had just woken up, was dressed and fed by the house-elf and ready to go downstairs. He pulled open in his door just in time to see a grinning Sirius sprinting down the hall, his normally coiffed hair messed up from the running. Regulus turned his head up the hall in the direction Sirius had come from and saw his 16-year-old cousin Bellatrix step onto the landing. There was steam coming from her head, purple steam since her hair down to her chest was covered in purple paint.

"Sirius!" she screeched and they both heard the barking laughter further down the hall. Bella raged and then stomped furiously down the hall, not even batting an eyelid at small, weak Regulus.

Regulus stepped quietly into the hall and headed downstairs. Bella would eventually catch up with Sirius and he didn't want to get caught in the crossfire. He made it into the foyer and to the living room to see a house-elf mumbling to himself while vigorously scrubbing at a large purple stain on the couch, matching the one on the wall behind it. He looked around, wondering where his other cousins were. They were much easier to get along with than Bella, but it seemed they weren't here. His parents had left him and his brother alone under Bella's care.

He heard a thump from upstairs, followed by another screech and another barking laugh before he saw Sirius practically jump from the top step to the foot of the stairs, before disappearing once more. Hurried footsteps came downstairs and now there was yellow on the entire left side of Bella's body to match the purple in her hair.

She growled and then turned to Regulus. She stomped up to him, grabbing him by his collar and lifting him off the ground. "Where is he?" she ground out.

Regulus was scared, he was always scared to be this close to his mad cousin. He stammered out, "I- I- have no idea, B-Bella."

She rolled her eyes and then dropped him to the floor, uncaring that he fell on his bum before walking off in the direction of the bathroom. She would find Sirius soon.

Regulus got onto his feet and sighed. Why was he such a coward?

There was a whisper and Regulus looked up. He saw Sirius' head pop out of the small cupboard under the stairs. He furtively waved Regulus over and the small boy scurried forward.

"Where's Bella?" Sirius asked, his head spinning wildly as if she would pop out at any second.

"She went to the bathroom to wash off the paint. Why did you do that, Siri?" Regulus asked as Sirius dragged him into the small space.

"I was bored and Bella was sitting in the living room," Sirius said with a shrug. Then there was a gleam in his eye, "I have one more balloon around here. Do you want to help me?"

"Haven't you caused enough trouble, Siri? You know Bella is already after your hide. Maybe you should just stop," Regulus begged.

"Live a little, Reg. Haven't you always wanted to get back at Bella for all the mean things she's said, all the bad things she's done?"

Regulus thought about it: all the teasing, all the hair pulling, all the hits, the bruises, the burns. Their cousin was evil. But Regulus shook his head, "No, I want no part of this."

Regulus pushed open the small cupboard, sparing a glance around for their cousin before walking out. "Coward!" Sirius shouted, before ducking out of the cupboard himself and heading in the other direction.

He was a coward. Regulus frowned as he returned to the living room, not really seeing where Sirius had run off to. He would never be brave or risky or cool like Sirius.

"Ahh!" there was scream coming from the hall where Bella had disappeared to. Regulus ran over and he saw Sirius in Bella's grasp, his feet dangling in the air. She had gotten all the paint off, not a blemish to mar her good looks but there was a look of pure murder in her eyes as her hands gripped tightly around Sirius' neck. "This is what rude little boys get for messing with me," she hissed as Sirius' hands desparately tried to free himself from her clutches.

The colour in Regulus' face disappeared. He always knew there was something different about Bella. She thrived on watching people squirm, but he wasn't sure how far she'd go. Now as she watched Sirius' face change colour, he realized that his cousin was truly pure evil.

Then Regulus spied something. A few feet away from the pair was a bright red balloon on the long rug of the hall. That must have been the one Sirius had left before his plans were foiled when Bella exited the bathroom to see him standing there 'red handed'.

Regulus walked quietly, trying to muffle his footsteps on the rug. He had to act fast. Sirius' movements were slowing down and Bella's grin just got wider. He picked up the balloon slowly, knowing he only had one shot to get this right. Sirius stopped moving, his eyes closed and Regulus threw the balloon as hard he could.

It all happened in slow motion: Bella's gaze shifted as the bright red balloon entered her field of vision, her mouth opened in shock as the scream started in her throat, the paint spread across her face, hair, into her mouth and across the front of her dress, making a huge mess on the rug, the floor and the walls of the hall, Sirius dropped to the floor in a heap, coughing and sputtering, he too covered in red paint, and Regulus stood there with wide eyes, surprised he had actually done it.

Bella screamed, throwing her arms into the air, spitting everywhere and then furiously wiping the paint out of her eyes. Regulus ran forward, grabbing the slippery Sirius off the floor and heading back upstairs to their rooms, never looking back.

They jumped into the closest room on the second floor, Regulus' room, slamming the door behind them and leaning against it. Regulus was breathing heavily, the adrenaline wearing off and the exertion taking its toll on his small body. Sirius was still gasping from Bella's hold and Regulus could see the red imprint of her fingers around his neck. Then he turned to Regulus with a grin, the red paint in his hair and in his mouth but he didn't care. He clapped Regulus on the shoulder and said proudly, "I didn't think you had it in you, Reg."

Regulus grinned back. Finally he was brave, and cool, and risky, like Sirius.