Here we go! Sasuke isn't too happy about the news of another big brother. After all, he didn't have a lot of luck with the last one!

Thank you very much to my beta, ReiraKurenai. She is helping me with my writing, as well as giving me some great ideas for future chapters.

Disclaimer: I don't own Naruto, Naruto Shippuden or any of their characters. I do own Katie - and she will own Sai someday. Just give her time! :)

Welcome to the Family

Sasuke didn't have to say a single word. It didn't take a sensory ninja to feel the negative vibes emanating from him. And he glared down at Sai with venom in his pitch-dark eyes.

"I'm assuming that you didn't come here to wish me a happy birthday," Sai stated flatly.

"Hn," was Sasuke's only response.

"Or welcome to the family."

Sasuke's whole body twitched after that statement. But his eyes never left Sai's.

Sai's ebony orbs locked with his brother's. "If you have nothing to say, then why did you come?"

"I had to take a look for myself."

"A look at what?"

Sasuke shifted away from Sai. "Sakura always said you looked like me." Then he turned his back on Sai. "I don't see it."

Sai was somewhat relieved that the confrontation was over. But… his relief didn't last long.

Katie stood straight up. "Of course you don't see it. Sai is much better looking than you are!"

Sasuke chuckled, but didn't turn back around.

"He's your older brother, you rat bastard! What about that is so hard to accept?"

Sai stood next to her and placed his hand on her shoulder. "Please stop. I don't need Sasuke's approval… or acceptance."

Katie turned to him with a sad look in her eyes. "How can you say that? Who doesn't want to be accepted by their own family?"

Sai shook his head. "It's a family that I never knew." He took a deep breath. "And I don't feel the need to get to know this particular member of it now."

Katie hung her head in defeat. She was disappointed that this was turning out so badly for Sai. He took his hand and tilted her chin upward gently so that she would face him again. "Don't worry about it. Sasuke and I have a history. We can't erase everything that we have been through in one day."

Sasuke had been standing there listening. He hadn't turned to face them again, but that didn't stop his curiosity from finding out what was going on between Sai and this girl he had never met.

"Why don't you listen to him? This is none of your business anyway," Sasuke called out from over his shoulder.

Katie straightened up immediately. "None of my business? I care about Sai, even if you don't. And I can't for the life of me figure out why you don't want to get to know the last remaining Uchiha… besides yourself."

Sasuke turned around and glared at her.

She placed her hands on her hips, faced Sasuke head on, and taunted, "What are you afraid of, King of the Uchiha? Are you afraid that your big brother will unseat you somehow?"

"That would be impossible," Sasuke asserted.

Katie raised her eyebrows. "Would it? He's the older brother."

Sasuke narrowed his eyes. "I would appreciate it if you stopped saying that."

"Saying what? Older brother?"

Sasuke twitched again. "I had an older brother. And that's… not… HIM!"

"A bit touchy, aren't we?"

At that moment, Sai grabbed Katie by the shoulders. "This isn't necessary. Let him go. I don't need him."

Katie pushed Sai away and stepped closer to Sasuke. "You had always wanted to rebuild the Uchiha clan. Are you afraid that we might do it first?"

Sasuke grunted, "You have a big mouth for a little girl. It will get you into trouble."

"And that is meant to scare me?" Now, not only were her hands on her hips, but she was leaning forward defiantly at the angry Uchiha in front of her.

"Sharingan!" Sasuke's red eyes glared at her with killer intent.

Katie just stood there and stared him down.

Sai looked at her in disbelief. She didn't look like she was suffering from Sasuke's genjutsu. He waved his hand in front of her eyes, but she batted it away.

"Is that all you've got big man? If so, I'm terribly disappointed."

"Not quite, big mouth. Chidori!"

Sai could hear the loud squeaking noise of Sasuke's lightning technique. He wasn't facing Sasuke directly, to avoid the Sharingan. But he put his body in front of Katie's to protect her. He saw her eyes widen before he felt the impact.

As Sai was losing consciousness, Sasuke grabbed him by the hair and tilted his head up. Sai didn't even remember seeing the red eyes. The next thing he knew, Sai was inside Sasuke's genjutsu.

It was dark… and cold. Everything around him was totally without feeling. He thought he knew what it was like to be devoid of emotions, but this feeling was 10 times worse. It was a numb feeling. A feeling of not even being alive.

Sasuke was standing there, and he wasn't making a move to torture him or stab him. He just stepped aside and said, "You want to be an Uchiha? Well, let me show you what it feels like to be an Uchiha. Welcome to the family."

A second later, Sai was witnessing firsthand the Uchiha massacre. One by one, he could see each one getting killed, and he could feel their pain at the brink of death. As every sword and shuriken pierced through their bodies, he felt all the intense sensations. It was burning, stinging and slicing him all over. And he couldn't escape from it.

It was horrific. One person after the other being senselessly massacred. The sight of it was nauseating. But the corresponding blinding pain was knocking him over the edge into insanity.

He then saw a younger Sasuke clutching his head and screaming, and he realized that this must have been shown to Sasuke as well, by Itachi himself. Sai could feel Sasuke's emotions as each and every one of his family members was murdered. It was almost more painful than the physical pain of death that he was also feeling, over, and over, and over.

Emotions overlapping with physical pain. It was unbearable. He couldn't watch anymore. He couldn't feel anymore. And he couldn't respond to it anymore.

Then he could see Itachi's face as he stood over Sasuke. It lacked any trace of emotion. He had caused all this destruction of life and familial love, and as far as he could see, Itachi showed no remorse. There was an ache in his heart that Sai could only imagine came from how Sasuke felt. This new pain was 1000 times worse than the others. This pain stemmed from utter betrayal and severe disappointment. In a matter of minutes, Sasuke's hero had turned into his worst enemy.

That, Sai realized, was Sasuke's strongest bond. And it had been obliterated in such a tragic way. From witnessing the depth of Sasuke's misery firsthand, Sai was gaining a better understanding of what created the man that Sasuke had become.

Sai was finding it hard to breathe. He just wanted to collapse so that the nightmare would end. But he knew that in the genjutsu, collapsing was not an option.

Sai felt a sharp pain in his neck, and he looked around for which Uchiha member had experienced their death in that manner. But then he noticed his surroundings. He was no longer in the dark genjutsu world. It appeared that he was back to reality.

That didn't put him at ease. It could still be Sasuke messing with his mind. He lifted his hands, and he couldn't see them. He moved his fingers, and only saw the grass that was beneath him.

What kind of genjutsu is this? He tried to shout out, "Sa-", but a hand cupped itself over his mouth before he could get the whole name out.

"He's still around. Keep quiet." It was Katie's voice, but he couldn't see her.

"I'm not afraid of him." But then the pain in Sai's back flared from where he was struck with the chidori. He started coughing up blood, but was amazed at the fact that he couldn't see that either. He could feel the wetness of it, but his hand and the liquid were definitely not showing.

"I know you're not afraid of him. But engaging in a genjutsu battle, when your Sharingan still isn't activated, may not be such a great idea." Katie whispered in his ear.

"Why did you taunt him? Didn't you think he would react?" Sai asked.

"I was counting on it. I just didn't count on you getting in the way."

Sai tried to straighten up. He was leaning against a tree. But the movement caused him to cringe and stay in his previous position.

Katie grasped his hand. "Why did you get in front of me? I had him!"

Sai closed his eyes. "I didn't want to watch you die."

"Die? Sasuke wasn't trying to kill me. He wanted to shock me a little. But I had a surprise for him… before you got in between us."

"Surprise? Are you trying to kill Sasuke?"

Katie giggled quietly. "No. Absolutely not. But all Sasuke understands is power. And … he has no idea about mine yet."

"Besides your Sexy no Jutsu?"

Katie laughed under her breath. "I'm flattered that you think I have a Sexy no Jutsu. But no. I will leave that to Sasuke's flat-chested girlfriend to show him."

"Ugly's going to beat you senseless for that comment."

"No doubt," Katie said.

Sai looked around. He couldn't see himself, Katie … or Sasuke for that matter. But he could feel Katie, especially the hand that was holding his. She was definitely there.

"Why are we invisible?"

He could feel Katie let go of him and stand up. He heard the sound of leaves crunch underneath her feet. A few seconds later, she shimmered into sight.

He looked down at his gloved hands. He was visible too.

"That's an interesting jutsu. Where did you learn it?" Sai asked.

"Don't worry about that now. Let's get Sakura to heal your back first." Katie offered her hand to help him up.

At first he was too proud. But after a few seconds of trying to get up on his own, he accepted her hand.

"That chidori hurts like a bitch, doesn't it?"

"Like you would know," Sai answered.

"I know more than you think," Katie said with an evil smile.

"Did you get me out of the genjutsu too?"

"Yeah … sorry about the neck. And don't try to use your chakra for a while."

"Great," Sai muttered as he stumbled alongside of Katie. "It's not like I would need it with an angry shinobi looking for me."

"Would you rather still be in his genjutsu?" Katie teased.

Sai shuddered. "No. Absolutely not."

Katie grasped his hand. "Well then, why don't you start with thank you?"

"Thank you? Being close to you is going to get me killed."

Katie giggled. "No, but being a ninja threatens your life every day. So it would be better to stay with me if you're afraid of getting killed."

Sai was still struggling to keep up with Katie's pace. But his ego refused to let him admit it to her. "I'm not afraid of getting killed. But I am afraid of you. What do you plan to do to me?"

Katie peered out to the busy main street of Konoha. "A better question would be…. What do I not plan to do to you?"

Sai looked over to see that her Cheshire cat grin had returned. But he was in too much pain to argue. At this point, she could do anything to him as long as she got the pain to stop.

Katie sensed his thoughts. "Don't worry. I won't do anything to you until Sakura fixes you up. I need you at 100% for what I have in mind. And judging by your posture and staggered movements, you're a real mess right now."

He quirked up an eyebrow at her. "No kidding."

"No need to be pissy. We will be at the hospital in another minute." They were already on the main street, and everyone that they passed by couldn't help but stare at Sai. Not only was his body hunched over, and he was almost tripping over his own feet, but there was quite a large burn mark on the back of his uniform and across the exposed skin on his back. He looked like he just got back from battle.

And … that's how he felt.

He was going to get Katie back for stirring the pot with Sasuke. Perhaps he would start with tying her to the bed.

Oh shit… she's really gotten to me! I'm in pain and that was the first thought that crossed my mind?

He glanced over at Katie. She still seemed proud to be walking down the street holding his hand, even in his current condition.

He let out a deep breath, even though it hurt him to do so. This breasty girl is going to be the death of me. If I was thinking with my head, I would run away as quickly as possible. I can't understand why I'm suddenly unable to use logic when I'm around her.

Sai shook his head to clear his mind. He looked up and noticed that they finally made it to the hospital. Sakura was on the second floor, and when she saw what condition Sai was in, she dropped her station duty and rushed him to an open room.

"How did this happen?" Sakura asked as she laid Sai down on his side.

He cringed as she prodded the wound. "We ran into Sasuke."

Sakura's eyes widened and she turned to Katie, who was standing on the other side of Sai. He was facing Katie as Sakura was trying to get the top half of his uniform off in order to heal the wound on his back.

"I was afraid of that," Sakura said in a sad tone with a volume a little louder than a whisper.

Katie glared at her. "Why? Why does Sasuke have to be such an ass? Doesn't he know that Sai is just as confused as he is about all this?"

Sai grabbed Katie's hand and pulled her down so that he could tell her directly in the face, "He doesn't care in the slightest, and if you upset Ugly and she punches me, I will come after you."

Katie smiled. "You promise?" She stared right into his ebony eyes and didn't flinch.

He stared right back. He understood her game finally. "Or… I will just ignore you."

Katie gasped. She shrugged out of his hold and stood straight up. "Sorry Sakura. I didn't mean to say anything bad about Sasuke."

Sakura nodded. She was already busy healing Sai's wounds. "I'll talk to him, Sai. I'm sorry that your birthday had to end up this way."

He couldn't see her, but he knew that Sakura felt bad about his confrontation with her boyfriend. Sai turned his head slightly so that he could address her. "Honestly, Sakura, I hadn't expected it to happen any differently. "

Katie opened her mouth, but before she could utter a word, Tsunade suddenly appeared at the doorway. She stood there with her arms crossed against her well-endowed chest, and had a very frustrated look on her face.

"Katie."

Katie cowered a little. Sai looked at her, and couldn't believe the difference in her stance from just a few moments ago. Evidently Tsunade was the only person that actually scared her.

"Tsunade-sama," Katie said as she bowed her head, and her focus shifted to the floor.

Tsunade lowered her arms and balled her hands into fists. "How am I supposed to keep you hidden if you insist on causing trouble all over the village?"

Katie slowly raised her eyes to look directly at Tsunade. "B-but, I-I don't want to be hidden anymore." She started to sound more like Hinata than her usual defiant self.

A smirk grew onto Tsunade's lips. "Is that so? Well, how does a caged bird seal sound to you?"

Dun da da ... Little Miss Katie has some secrets. It will be fun to find out what they are. For me too. I am coming up with this as I go along. This was supposed to be a one shot! I have major points that I want to write about, but the rest is coming to me over time. So I am as excited as you are with some of the twists that are coming about.

Katie is from my novel, Indulgence. Please see main page for link.

I love, love, LOVE reviews! :)