My Brother's Guardian

(A/N: I saw tons of child!Sherlock and teen!Mycroft so I wanted to try it. This is basically drabbles of Mycroft looking after Sherlock since their father has no interest/abuses him and their mother is busy with work. I know in the show, his parents are good and caring people, but go with it. I love the idea of Mycroft taking Sherlock under his wing and being very protective of his baby brother. Eurus will appear but is only minor and disappears after she's four years old. If you don't like the book, please don't read it.)

Hello, Brother of Mine

Seven-year-old Mycroft eagerly sat in the hospital chair, waiting for his younger brother or sister to be born. Unlike most kids, he wasn't jealous of his mother having a baby. He knew what was going to happen. He knew that he would still be as much loved as he had been before the baby. It just meant that he would share his parents since the baby was helpless. Until the baby was about a year old or so, he would need constant attention. He enjoyed the thought of possibly getting a brother to mentor and have be just like him.

While his mother was excited to have another baby in the house, his father could care less. In fact, he wasn't even here to support his mother or see his new sibling be born. The fact that his father could care less made Mycroft's blood boil. How could his father be so heartless? While Mycroft often seemed cold and distant, he had feelings of protection towards his new sibling.

Nine months, earlier, his mother had announced her pregnancy at the dinner table. Six-year-old Mycroft had been eating at the table, talking eagerly with his father. It had been a normal day in the Holmes household. Gregory had been away all day at work and had come home just in time for Mycroft to get home from school. Lydia had been at work as well, but had come home a bit earlier than usual.

"So, Gregory, Mike, I have some news," Lydia smiled at them and Mycroft had deduced that she was either pregnant or his mother had gotten a new job. He figured the first seemed more likely.

"What is it, my darling?" Gregory asked, winking at Mycroft and returning to eat the lasagna on his plate.

Mycroft kept quiet and ate his plate, eager to get back to his studies.

"Well, I took a pregnancy test today, and it was positive. I'm pregnant. We're having another baby!" Lydia smiled eagerly.

Mycroft grinned up at his mother. "Am I really getting a baby brother or sister?"

Lydia nodded with a smile. "You sure are, buddy."

Gregory's smile turned into a grimace. "Do we really have room or necessity for another baby, Lydia? Besides, we have Mycroft. That's all we need."

While part of Mycroft was happy, the other part was angry. Though he hadn't known his baby sibling for long, he was protective of it. Plus, his father seemed a bit too angry about the situation.

"Darling, we can't just get rid of it. It's joining our family plus Mycroft could use a playmate."

Throughout the pregnancy, Mycroft had noticed that his father acted a bit odd. He didn't talk lovingly to it like he would to him. He wouldn't even go with his mother to the doctor's appointments. He just acted like it was a nuisance or a brat. He treated it worse than he treated strangers.

"Master Mycroft, your mother is ready for you to meet your baby brother," The nanny, Dorothy, smiled at him.

Since his parents were busy, they had a nanny on hand. Their parents had a maid, a nanny, a butler, a chef, a gardener and tons of hired help. The nanny, Dorothy, was a very kind but stern woman. She never took nonsense from Mycroft but she would be very gentle about it.

"A brother," Mycroft stood up out of his seat and took Dorothy's hand. Though he felt silly doing at seven, he didn't want to make a scene.

Dorothy smiled at him. "Yes, his name is Sherlock. William Sherlock Scott Holmes, but he's going to go by Sherlock."

Mycroft grinned at the thought of a brother. He had someone to mentor and teach everything that he knew. Evidently, it seemed that his father had no interest in seeing his new son, so Mycroft would be like a second father. Mycroft had no idea what that would mean later on. He just knew that it meant he would have a significant role in raising Sherlock.

"It's a pity that Father doesn't even want to meet him," Mycroft frowned but put the thought out of his head. He needed to be strong. If not for himself, then for Sherlock.

With a smile, Dorothy looked at the boy. "I'm sure that he'll grow fond of the idea of having another son around."

Mycroft shrugged. "It's not likely."

Dorothy frowned at the boy but decided not to push the matters further. Walking to the room, she let go of his hand and opened the door. It seemed like an eternity to Mycroft who had been patiently waiting for nine months to see his new sibling. He was incredibly excited to get to hold him.

When he had walked in the room, Mycroft had immediately noticed that it had not been as cleaned as the other rooms. This was a room that was frequently used or was carelessly cleaned by the housekeepers. It wasn't ideal conditions for mother or for baby. It angered Mycroft but he let it go.

"Hello, darling," Lydia smiled and patted for him to come sit by her. In her arms, a small blue bundle was wide awake.

From Mycroft's deductions, his mother wasn't in any pain. Well, if it was, it wasn't excruciating. He knew that there would be some soreness after delivery, but right now, she would be fine. It also seemed that the baby would be fine. It looked small, but it didn't seem to be lacking nutrients. To Mycroft, everything seemed alright aside from his father not being here.

For a baby, that was odd that he wasn't sleeping. Eagerly, Mycroft crawled onto the bed. At long last, he would get to see Sherlock. Peering into the blanket, he bent the blanket back so that he could get a proper look. Sherlock didn't seem to mind his brother doing that. He was incredibly cute. Well, as cute as babies can be, but Mycroft was never one for emotions.

Sherlock had a headful of thin curly black hair that made him adorable. His eyes were a stunning blue, just like Mycroft's were. So, the boys looked quite a bit alike which pleased him. Normally, babies didn't affect him much. Babies were babies and they just were a result of sexual intercourse. This was different. His brother was totally different.

"Say hello to your new baby brother, Sherlock," Lydia rocked sleeping Sherlock and Mycroft noticed that he was starting to shift in his sleep.

A restless sleeper, just like he was.

"Mum, can I hold him?" Mycroft looked at his brother who had opened his eyes again towards him.

Mycroft had sworn he had seen Sherlock give a smile towards him.

With a smile, Mycroft carefully held his baby brother. Though his brother felt small in weight, he was tall. He estimated that Sherlock was about 21 inches long and five pounds. The baby boy was dressed in a blue onesie with sleeves that covered his hands to prevent scratching himself. Though the baby didn't seem too interested with his face. He seemed to be studying (yes, studying) Mycroft's face.

"Sherlock, I'm your older brother. As they no doubt have told you, I'm Mycroft. I really am sorry that our father isn't here, but he doesn't seem to care about you. It doesn't matter, though. I'm here, Sherlock. Your big brother will always look after you and won't let him hurt you."

Mycroft adjusted his hold so that he could get a better view of his brother's face. It amazed him how a baby could make him act this emotional. Emotions were never his strong suit, but Sherlock made him act different. Later on, the brothers would act just like each other.

Sherlock seemed to understand what he was saying and regarded him with a smile. Though, Mycroft passed it off as a gassy smile.

"He seems to love his big brother," Lydia smiled. "I do think your father cares, though."

"Mother, I hate to fight in front of Sherlock, but he doesn't."

With a frown, Lydia looked at her sons. The elder one was holding the younger and singing a lullaby to him. It warmed her heart that at least Mycroft was getting along with Mycroft. If Gregory wasn't going to care, then she was glad that her sons would have a close bond.

"How long do I get to stay here?" Mycroft asked. "Can I do my studies here so that I can stay and help you with Sherlock?"

Today, Mycroft's homework was quite light. All he had was Math homework and history homework. They were simple sheets that he could finish in about two minutes since the teachers at his school were incredibly dimwitted. His brother was more important than school was, right now.

With a considering look, Lydia nodded. "If you don't have too much homework, you can stay and help me. I'm sure Sherlock would enjoy having his older brother here to play with him."

With a happy look, Mycroft handed Sherlock back to his mother and took out his backpack which eventually would become his brother's. The math sheet was quite below his level. They were learning how to use money but he had learned how to do that at age three. Right now, he was able to do multiplication and division with fractions and do long division in a minute.

"That seems like easy work, darling," Lydia smiled and fed Sherlock who seemed uninterested with eating. Little did Mycroft know that would be an indicator for the future.

With a shake of his head, Mycroft carefully put the paper back in his backpack. "It is very easy. Even Sherlock could probably do it."

Lydia laughed and draped Sherlock over her shoulder, patting his back so that he could burp. "I don't think Sherlock can quite do math yet, but with your tutoring, I think he could pretty quick."

Mycroft grinned down at his sheet and studied the questions in his textbook. The sheet was on World War II, on D-Day. Like his math sheet, it was incredibly easy, but it was a lot more interesting. He enjoyed learning about history, especially Britain history and politics.

"My bright little boys," Lydia was rocking Sherlock so that he would go back to sleep and it seemed to be working. The baby's eyes were starting to close.

With big eyes, Mycroft reached and touched the blanket, trying to rub it soothingly to calm his brother who was now fussing. It seemed that he was the kind of baby who was hard to calm, but Mycroft didn't care. Though it would get annoying, he wasn't about to abandon Sherlock.

"Can I try rocking him?" Mycroft extended his arms to the crying baby.

With a nod, Lydia gently put the baby in his arms. Sherlock's cries started ceasing as Mycroft sung a lullaby to him. It was one that would continue to soothe Sherlock even in adulthood. It seemed that the brothers already had a bond that couldn't be broken.

"I think you have a magic touch, darling," Lydia looked down at the baby who was sleeping in his arms.

With a chuckle, Mycroft looked down at his brother. "I'll never let him get hurt. I'll always be his guardian. Even when he doesn't want it, I'll give it."

The baby slept happily in his arms and Mycroft kissed his head. There was nothing that Mycroft wouldn't do for his baby brother. He would go to the ends of the earth for his brother.