Sasusaku story: Tsunade ends up using Sasuke as a test subject for her youth reductions serum, but this didn't turn out the way that she had planned. Forcing her to leaving the little Uchiha in the hands of her apprentice Sakura till she finds an antidote.

Note This is after the war when Sasuke returns to Konoha.

I DO NOT OWN NARUTO!

Enjoy!

CHAPTER 1

"…Are you sure that this is ok Tsunade-shisou?"

Tsunade looked over at her worried apprentice with dedicated approve in her eyes. She was at the Hospital Lab teaching Sakura how to mix certain herbs that can make people younger in age and appearance. Although it could be useful for future references Sakura couldn't help but worry because their test subject was none other then the not so thrilled, lone Uchiha surviver Sasuke.

"Do you mind explaining to me why am I'm your guinea pig" Sasuke ask with a scowl on his face

"Because we need a test subject and this is part of your punishment for betraying Konoha, in other words this will be apart of your mandatory voluntary assingment" Tsunade states with a smirk on her face

Sasuke groans and decided that there's no use in arguing with her. He looked over at Sakura and gave her a nod signaling her not to worry so much, and she smile in return.

"OK on with the experiment!" Tsunade yells with excitement

She pours the purple thick liquid in a small science tube and gave it to the Uchiha. Sasuke hesitated a bit and slowly drank the potion that was given to him.

"So… do you feel anything?" The pink head asked curiously.

"No…" was the response given. The Blonde examined the raven haired boy for any changes but luck wasn't on her side at the moment. She then took note on the matter in her journal on the failed experiment.

"But I don't Understand shisou shouldn't the herbs have some type of effect on him, I mean they're very effective when used for healing and restoring energy." Sakura says with confusion flooding her head.

"hmm maybe we didn't give him enough, Sakura pass me the remaining's of the serum." Tsunade commands

"Yes Ma'am" Sakura fetched for the bottle full of the purple potion and gave it to Tsunade.

"Sasuke Imma need you to drink half this bottle." the blonde commands

"… Are you trying to kill me?" Sasuke ask with a stoic face

"Shut up and drink damn it, I promise it wont kill you."

Sasuke takes the bottle and looks at Sakura for approval. She shrugs her shoulders with a confused look on her face thus making Sasuke sigh and drink half the bottle. They wait for five minutes but there was no change.

"WHY ISNT IT HAVING ANY EFFECT! THIS ISNT POSSIBLE!" The full chested woman yells in disbelief.

"Maybe we brewed the herbs wrong, or it could be possible that they canceled each other out during the filtering process, I mean it is our first time mixing these kind of herbs together at once." Sakura states to her teacher.

"As long as I'm not physically in danger because of this dumb experiment, I could care less if it works or not. I'm just wasting my time here." The dark hair man says while glaring at Tsunade.

He then gets up from his seat and was about to leave when Tsunade pushes him back down to sit.

"Not so fast Uchiha, I'm not done examining you yet. I'm going to need to keep you here in the hospital for awhile for further inspection, we are still unsure if the serum is in full effect right now or if it is a dud." Tsunade says in a very serious tone

"And how long do you think he will have to stay here?" Sakura asks

"Till I am for certain the potion doesn't work or visversa."

Sasuke groaned in anger at the fact that he would be stuck in the hospital for who knows how long and would be missing out on his training. It bothered him that they chose him out of every person in the village to be their little lab rat, just thinking about it made his blood boil.

"Hey Sasuke-kun it'll be fine at least your not gonna die or anything, besides potions like that will be out of your digestive system in no time."

"Hn… What did I get myself into?" Sasuke grumble. At the same time Sakura looks out the window at the setting sun signaling the end of the day is near.

"Well its getting late I should be headed home now shisou" Sakura says with a smile

"Very well I'll see tomorrow then" Tsunade says waving good bye.

"Ok, I'll see you tomorrow, bye Sasuke-kun." Sakura says

"Hn…" was all that was said from the raven haired man and Sakura translated it as Sasuke way of saying good bye.

The Next Day!

Sakura woke up with a yawn and a stretch to start the day. She walk to her mirror and grimaced at how messy her hair was but was relieved that it can be a easy fix since its shoulder length, she brushed her hair and curled the tips till it was to her liking. She then freshened up in her bathroom and got dressed(picture her In her clothes from Naruto the Last, with the green sweater) and ran out to meet Naruto at Ichiraku's.

At Ichiraku

"SAKURA-CHAN!" Naruto yells from his seat while waving

There sitting with Naruto at the ramen shop was Hinata and Sai.

"Hey guys, how are things?" The bubble gum haired woman asks

"Everythings ok here, just watching Naruto consume ramen till he chokes" Sai says in a very calm manner.

"Hey! Im not going to Choke Sai!" The blonde boy yells to his teammate

"U-um hello Sakura-chan, hows everything at the hospital?" Hinata asks

"Everything is fine actually; Im going to stop by there later on today." Sakura informs to the blue haired girl.

Just as Sakura was about to take a seat to order a bowl of ramen an Anbu appears.

"Anbu? What are you doing here?" Naruto yells while pointing at the Anbu with a confused look on his face.

"Im sent by the Hokage-sama to retrieve Haruno, Sakura and bring her to the Hospital at once."

"Is every thing ok?" The pink haired girl asked with a worried expression

"Its better you come and see for yourself." The Anbu says.

At the Hospital

The moment Sakura walks into the hospital door all she heard was a loud scream that sound like a child crying and people scurrying around the hospital.

"SAKURA!" The full chested blonde yelled

"Yes Tsunade-sama!" Sakura replayed

"Don't just stand there get in here and help us stop this child from crying!" Tsunade says in annoyance

Sakura ran into the room and saw a little cute Chibi version of her childhood crush dressed in a Navy Blue top that's way bigger then it should be. Sakura slowly approached the hollering infant and realized that he was constantly crying for his Okasan. When she was about two inches in front of the bed, the baby stopped crying and looked up at Sakura. After about three minutes of silence the little raven haired boy smiled and raised both of his arms up to Sakura signalling her to pick him up.

"KAA-CHAN!" The small child yells with excitement

"Wah?! B-But I-Im not your Kaa-chan! Sakura says in shock and confusion.

"Sakura just pick him up before he starts crying again." Tsunade says while pinching the bridge of her nose to try and prevent a head ach from surfacing

With that said Sakura picks up the baby and the little boy snuggle against her neck while gripping on to her shirt not wanting to be let go.

"Hey Shisou who is this little boy and why is he calling me his Kaa-chan, I don't recall ever getting pregnant?"

"Sakura that little boy in your arms just so happen to be Uchiha Sasuke." The Blonde Hokage states with a smirk on her face as she grabbed her journal from the counter to take notes.

"WHAT, B-but how did he- When did he-…..WHAT HAPPIN?!" Sakura was so confused she started to get a bit dizzy. So she sat on the bed to keep from falling do to shock.

"It would seem that the youth serum we gave him the other day started to take effect over night. As for his infant state, we may have given him a bit to much." Tsunade explain while writing in her note book.

"That explains his appearance, but why is he calling me his Kaa-chan? Doesn't he remember what his real Kaa-chan looks like, Shouldn't he still have his memory?" The pink haired apprentice asked with a questioning look.

"hmmm well the Youth serum didn't just effect his body but also his brain, if he looks like a baby and acts like a baby, then he will most likely think like a baby, and he is probably just going off of his Maternal Instinct, note that you came in dressed in something different then in your medical uniform like the rest of us here. And like a baby would do he automatically assumed you are is Oka-San." Tsunade says while examining Sasuke.

"So then what should we do now?"

"I have to create and Antidote to turn him back to normal now that I know that the experiment was a success. In the mean time imma need the little brat out the way so I can concentrate, and since you're the only one he seems to trust most im assigning you a mission to take care of him till the Antidote is ready." The full chested woman states

"Hai Tsunade-shisou" Sakura grabs all of Sasuke's un fitted clothing and places them in a bag. She then leaves and heads straight for the clothing store for toddlers.

"Hm since you will be staying with me it would be best to buy you clothing that's more fitted for your sizes." Sakura says to the now sleeping Uchiha. "What color PJ's should I buy you?"

After about an hour of shopping for clothes, she heads to a market and bought food supplies to stock up her house now that there's going to be an additional person staying with her. On the way to her home she couldn't help but buy a blanket for the child and a couple of toys to keep him occupied. When she got to her house she placed everything down in the kitchen and walked to her room. She put the little Sasuke on her bed and tucked him in since he was still asleep and walked back to the kitchen to unpack everything she bought. After everything was put away Sakura went to her room and decided that much sleep will be needed for the next day with the now so small Uchiha baby. She tucked herself in on Sasuke's left side, wrapped her arms around the sleeping baby, and closed her eyes drifting to sleep.

To Be Continued!

Review and Critiques are welcomed, let me know how you feel about the Chapter.

I will continue the Story as soon as possible.