So this is a little different, but I had fun writing it :) haha

One of the perks of being a younger sibling is having someone to look up to and answer any questions you may have. Sasuke found this to be especially true when it came to Itachi, for he was a prodigy and knew all sorts of things about life.

One fine afternoon, Sasuke approached his big brother to receive information on a topic he knew nothing about; the only reason he even knew the name of it was due to some if his fellow classmates mentioning it.

"Hey, Itachi..." Sasuke began.

"What can I do for you, Sasuke?" His older brother replied as he looked up from his paper work.

"What is sex?"

... Itachi was shocked to hear his seven year old brother mention such a thing. "What?" Itachi believed he must have heard little Sasuke wrong.

"What is sex?"

He heard right, though he didn't know what to reply. It was not okay to tell a mere child what physical love was, so Itachi instead turned to questioning his little brother. "Where did you hear of that?"

"There was some older kids at the academy talking about it today." Sasuke answered innocently.

"I see..." Itachi sighed.

"What is it?" Sasuke begged to know more.

"It's nothing that concerns you at the present time, and won't for quite a few years."

"But I want to know!"

"I have a lot of work to do, Sasuke." The elder unsuccessfully tried to change the subject.

"You always say you're busy. I'm not leaving until you give me an answer." He replied stubbornly.

Itachi knew that Sasuke was serious when it came to bothering him until he was satisfied, but there was no way he could tell his kid brother about the physical relationship between two lovers. "Alright... It's... Something that two people do together when they are in love."

"What kind if thing do they do?" Sasuke inquired.

"Umm, they..." The older Uchiha sibling did not know what to say, "they physically... connect and show their love."

"I don't get it." Sasuke whined as he advanced into his brother's room. He took a seat on the floor near Itachi and gazed up at him with a curious expression.

Itachi, who was sitting in a chair near his desk averted his eyes from his inquisitive sibling. "You're not supposed to get it, Sasuke. You're only seven."

"That's not fair! If you know, I should know too!" He protested.

"That's not how things work."

"Brother! That's not fair!"

"Neither is life, so get used to it." Itachi replied.

"Tell me!"

"I did tell you, and you didn't get it so I can't help you out."

"I'll go ask mother, then." Sasuke resolved and got up from the floor. He started making his way towards the doorway when Itachi spoke up.

"Don't ask her!" Itachi shouted. Mikoto would be petrified if her little boy inquired about sex at such a young age.

Sasuke realized his new leverage on his brother. "Either you tell me or I'm going to ask her."

"Fine." Itachi replied reluctantly. "Just come sit back down and don't say a word about this to anyone."

Sasuke was elated and gladly returned to his previous location at the base of Itachi's chair. "Okay... So a male and a female are different in body structure. A man has a part that goes into a woman and can fertilize her eggs-"

"You're making this up," Sasuke said, "why would a man put fertilizer on eggs?"

Itachi face palmed. "I don't mean eggs as in bird eggs. It's much different and the 'fertilizer' is produced by the man to make a baby inside the woman."

"So he puts part of himself inside her and stuff comes out of him?"

"Basically, yes."

"Why?"

"To make babies or to..." Itachi trailed off as he realized what he was about to say.

"To what?" Sasuke interrogated.

"Nothing."

"Itachi!"

"I wasn't going to say anything else."

"I'm going to go tell mother what you just told me." Sasuke threatened.

Itachi was furious that his kid brother had something over his head. "Alright, I'll tell you! Sometimes they do that for entertainment..."

"Is that normal?"

"Yes, Sasuke. Are you happy now? I've told you what you want to know."

"I guess so," Sasuke mused, "have you ever done it?"

Itachi's eyes grew wide with his brother's question. "That's none of your business. It has nothing to do with you."

"Eww!" Sasuke squeaked. "You have!"

"Don't you dare say a word about this, understand?" Itachi threatened, though he would never actually hurt his little brother.

Sasuke didn't challenge his brother's threat. "I won't, but you're still gross."

"It's not gross. How do you think you got here?" Itachi questioned.

The younger boy was disgusted at this. "You mean mother and father...?"

"That's right. Aren't you glad you asked?" Itachi taunted.

It is needless to say that little Sasuke avoided conversation with his mother and father for the following few days. He didn't want to think about the disgusting things that brought him to this world.

Note: in episode 141 of Naruto Shippuden, Tobi mentions that Itachi killed his lover, so I based his actions off of that.

I also want to tell any readers that I am going to start another story; this one is hard to come up with ideas for, but I will keep adding to it. I have another story in mind that I will be writing, so new chapters will not occur as often here. If you have any ideas for a flash back of the Uchiha brothers, please put it in a review or a message and I will add it in! Thank you all!