Disclaimer: I do not own Harry Potter, not even a small part! :D
Bellatrix doesn't miss her old life. Bellatrix loved her new life working under the darkest wizard of, probably, all times. The world seemed to think along that lines nowadays, even her only sister left (because Andy doesn't count), Cissy, thinks she have forgotten all about their family. Of course, Cissy remembered, always the dear one.
Okay, that sounded like she was annoyed with Cissy. No she wasn't. She loved Cissy, the most among all the Blacks. Scratch that, she used to prefer Reg, he at least understood the wonders of their Dark Lord. They shared the same view. That was until poor little Reg, despite being the youngest, died first.
Cissy only followed the Dark Lord because of her husband and Bella's old classmate, Lucius, and to be honest, Bella prefered Lucius better than Cissy. Cissy had already been corrupted by their dear older sister, Andy. She will admit that she hated Andy the most but only because she corrupted Sirius (he had evil in him, don't let him fool you).
Okay maybe not, she partly hated Andy because she was always the favourite, umm... second to Cissy but Cissy never had any craving for attention whatsoever. She rarely stand up to lead, it was mostly... well, everyone in the family but her who tried to do that. All she was concerned about proving was that she wasn't dumb and you didn't need to lead to be smart.
Reg was the youngest, never a threat to her lead in the Black family (perhaps that is partly the reason that she liked him best). Sirius had enough will and ability to do it, no problem, except he was always rebellion thus their parents would never trust him. Cissy, as stated has no will. Andy, however, had a strong will, good behaviour and favouritism. Which means she was always picked (beyond annoying)!
However, she still missed them (no point denying to herself, Voldemort can't read her brain since she is a accomplished Occlumency) contrary to what everyone think. She missed quite a few of her adventures but to be honest, she still had favourite - the first one she led of course.
The reasons this is the best is because first, she lead this because her parents were afraid that Andy would not allow them to torture muggles. Second, because, well simply because they were muggle torturing. Thirdly, because this was the first time she met her best friend, Lucius Malfoy. And not, she doesn't love Lucius Malfoy. She only liked him as a best friend since he was the most worthiest of being friends among all the Death Eaters.
They were walking down the muggle street in the middle of the night, looking for any awake at this time to be tortured. Nine-years-old Andy growled in frustration, mumbling about how stupid they were to actually torture people. She claimed she wanted to lie (which she can't by the way). Seven-years-old Bella had rolled her then and now, thinking back, she rolled her eyes. She honestly didn't know how both of her sisters got into Slytherin because as far as she was concern, Andy was too Hufflepuffy nice and as much as Cissy seems so calm and collected, Bella could tell you exactly how Griffylish impulsive she could be!
She recalled that Sirius had leant forward in anticipation, wondering how the muggles would react (always the curious one) while Cissy looked frightened at the prospect of their torturing. Reg, despite being the youngest had a trademark Slytherin smirk which he shot Bella, meaning to say, he was so in! But of course he wasn't dumb enough to say it in front of dear old Andy.
Bella had been in charge and she taught all of them how to torture and use the spells. She thought them strange spells of attacking, defending, torturing, forcing answers, etc. Reggy did all of the above with ease... well, as much as a three-years-old could but he did it with confidence and hope, like he wanted to get it right. Bella told him that he would when he grow older.
Of course Andy did it with ease although she obviously didn't want to. She had irritation clearly etched onto her face but she was Andy. She always followed mummy's order and she also knew that Bella would tell on her if she didn't do it. Her parents would be beyond furious she refuse to muggle-torture and they would not hear a word about how she thought it was a dumb idea in the first place.
Sirius smirked, not in a very Slytheriny way (you'll have to see a lot of it to tell the difference), and fired spell after spell, perfecting everything Bella just managed which irked her a lot. Cissy did equally well at first but broke down half-way doing the torturing curses. Andy had picked up this opportunity to pull Cissy into a comforting hug while glaring at Bella, yelling that she was pushing her too hard.
Bella glared right back, her voice in a equally enraged tone. "Reggy could do it. It's the simplest torturing curse!"
"Well maybe she isn't you or Reggy or Sirius. Maybe she wasn't meant for this path of evil and torture you're pushing her on! She's only five, Bella. Spare her," Andy exclaimed, her voice matching even with Bella.
"Maybe you aren't either! Maybe you should bring her away! Maybe..." Bella hadn't finished her sentence when Andy interrupted her.
"Maybe I would right now," her voice was no longer angry but a calm, collected tone. She held out her hand to Cissy. "Come on, darling. We'll go somewhere where there is no one getting hurt," she suggested. Cissy looked hesitantly at her then Bella. She didn't want to break this family bond they had and by leaving, she knew it would be broken. She also know that if she didn't leave, Andy still might and she didn't want Andy to be all alone.
"Excuse me but if you want to muggle torture in group, make less noise," A soft drawling voice called to them. All five raised their head to be faced with a boy with Albino white hair and his face paler than his hair, if possible. He looked positively like a ghost in the middle of the night, which was pretty cool to Bella.
"We're..." leaving. Bella knew that was what Andy was about to say but she cut her across before she could say anything else. This boy muggle tortured, that means he was a pure-blood. He worked alone, even though he looked about seven only, Bella's age. And he seemed like a pretty cool friend considering the fact that he seemed to like the sound of muggle-torturing.
"You do it alone?" she asked, boredom evident in her voice as she was taught to keep her voice emotionless.
The boy looked startled at Bella's sudden question but he nodded. "Usually, I do it with my friends, Crabbe, Goyle and the Lestrange but they're busy today," he announced.
Reg beamed exitedly. "Could we join you in future. You could join our adventures too, I wouldn't mind! Would you?" He turned to the rest of them.
Under normal circumstances, Andy would be the first to reject and Bella would argue with her before they decided with something but today was special. Reggy was beaming at her and she couldn't disappoint him. "Okay," she replied in a clipped tone and it was amazing how much menace she could put in one word.
"Totally!" Bella agreed and she and Andy glared at each other for a moment before turning to the two five year olds.
"He seems cool enough," Sirius said with a shrug, then he frowned. "But no one will make Cissy do spells she won't want to again," he added with a growl.
Lucius took a few more moments before he guessed. "The Blacks?" he asked, respect clearly marked in his voice.
Bella nodded, her head held high. "Bellatrix, Andromeda, Sirius, Narcissa and Regulus," she stated, gesturing at each of them.
Lucius blinked in surprised. "I'm Lucius Malfoy... but, you sure you're not pulling my leg. That one looks nothing like a Black. I was guessing she was a family friend or something." At that moment, he got a series of response.
Bella chuckled at the thought. She herself always thought Cissy looked too pretty and too sophisticated and too delicate to be a black. After all, she took after their gorgeous mother. Andy made an angry noise and slapped Lucius across the face for suggesting such a thing. Narcissa gave him the famous Black glower which pretty much confirmed she was a Black.
Meanwhile, Sirius bellowed a cheer as he stuck out his hand to the three-years-old. "I told you!" he roared.
"That's not fair!" Reggy stormed his foot. "Cissy always get noticed."
"Too bad you ain't pretty but that doesn't cancel out the fact you now owe me 30 galleons that you will pay when you get money to buy your own birthday present at eleven!" Sirius cheered again while Reggy groaned.
Andy narrowed her eyes at Sirius. "I told you not to..."
"I am a Black and if you suggest anything else, I... I'll use that spell Bella just taught me," Cissy declared to Lucius, who seemed to take it as a challenge.
"Oh yeah?" he asked with the famous Malfoy smirk as he took a step closer to her. "What exactly did Bella teach you? That simple torturing spell that I can easily defend?" he asked, clearly enjoying this moment. He thought he would win this. Key word: He thought.
"You really don't want to find out," Cissy informed him but Lucius didn't seem to agree.
"I dare you to," he replied.
Sirius was about to warn him about how Cissy could get real dangerous if she's angry when she raised her wand and pointed it at Lucius. "Crucio!" she cried and all four heads snapped to the two of them as Lucius writhed on the floor and Cissy smirked at him instead.
"Cissy!" Andy exclaimed in horror as Reggy and Sirius roared in laughter. Bella lifted the spell from Lucius, clearly not trying to laugh.
"That was..." unexpected, he was going to say but Bella interrupted him by hugging Cissy and screaming "you did it". Oh well, he could leave telling her about how wonderful she was to the future. Cissy gave a half-hearted smile. She was sure she did not just curse Lucius Malfoy for her sister's approval (Bella) and disapproval (Andy).
Bella loved everything that day, even the arguments with Andy and when she sent that curse that killed her little cousin, all she could think was how she taught him nearly half the spells he knew and she recalled him doing the very spell that she used to kill him for the first time, clearly. It was painful and like it or not, Sirius was her cousin and as much as she wish to deny it, she realizes that she, indeed, does love him.
So perhaps Bella could be better as a teacher, she was a excellent one and she takes pride when she sees they succeed. She knew she could be but interest in the Dark Arts seemed to have pushed the little talent out of her mind. When Molly sent that killing curse at Bella, she wondered if things would have been different if she became a teacher instead.