A/N ok making a story is much harder than i thought. but i will finish this even if it kills me.(too lazy to make up another author's note)

Disclaimer: i dont own prince of tennis. i wish i did but i dont.

Chapter 1:

"Inui. What did you do to our kohai?" asked Fuji with his trademark smile. You see the reason he asked is because Kaidoh is laying sideways past out on the bench with a bottle in his hand. The regulars surround him with various faces of concern. "I did nothing other than what I normally do" inui replied Looking at his favorite kohai, notebook in hand ready to collect data.
"That explains it nya!" cries Eiji clutching onto his partner in fear.
"Hm"
"What's wrong echizen" asked Momo
"Nothing. But does Kaidoh-sempai look a little different to you?"
Everyone looked at the prodigy curious. Takashi went ahead and asks the question on their minds. "Ano, Echizen what do you mean something's different?" Momo steps up and moves over to his fallen rival. "yea, I mean come on," he says as he shifts Kaidoh's body to face forward, "the only thing that could've changed is that he'd have gotten ug..li..er.." Momo stops as he looks at the body in front of him.

Oishi who is worried comes over to where Momo is. "Momoshiro what's wrong?" he asks tapping the second-year on the shoulder. That seemed to snap him out of his shock, as he starts panicking and running around like a chicken without a head. Eiji manages to grab on to the frantic peach and stop him. "Momo, what is wrong nya?" the junior stops and looks at his sempai with a frightened look. " what's wrong?" he says and grabs the others arms, " I'll tell you what's wrong. The VIPER TURNED INTO A FEMALE!"

Kaidoh at this moment is woken up from the noise around him. He sits up, not paying attention to the difference in the weight on his chest, and looks up. To see seven pairs of eyes looking at him.

"What are you looking at"
"Oi, mamushi did your chest always stick out like that?" asked Momo slightly noticing that the viper's voice is not the usual grunt.
"What are you talking about baka?" replies Kaidoh not noticing anything different.
"Uh, Kaidoh look down" said Oishi with a look of concern. "Hm" Kaidoh looks down to see two large lumps poking from his shirt. "What in the hell…"
Kaidoh finally noticing something's wrong, runs to the mirror in the bathroom (unknowingly followed by his fellow regulars) and almost had a heart attack. In the mirror, staring back at him was a girl. She had the figure every girl dreamed of having. She had long black hair and onyx eyes. She was wearing the seigaku regular's uniform that's apparently too tight in the front. There was a green bandanna on top of her head and she had a nice, calming voice. That apparently can turn into the screeching of a banshee like it is right now.
"What the hell did you do to me Inui-sempai!" screeched the now female Kaidoh, making everyone plug their ears in fear of going deaf.
"Ii data" Inui remarked, making everyone look at him like he lost his flippin mind. Kaidoh tries to become calm as he walked up to his sempai. "Inui-kun" says Kaidoh sweetly, "tell me what's happening and fix it or else I'm going to gouge out your eyes and burn your notebook"
Inui's face went blank at this. "Kaidoh" he started slowly in fear of being attacked, "I think it's because I mixed a bunch of random ingredients and chemicals. Not to mention this one strange mushroom with a symbol on it" he stops, noticing everyone's staring at him. "What?"
" A mushroom with a heart on it?" asked Oishi
"yes"
"and you just found said mushroom?" asked Fuji
"yes"
"and you just used it as an ingredient?" asked Eiji
"yes"
"without knowing if it's poisonous?" asked Taka-san
"yes"
"and you just give it to your kohai without testing it first?" asked Ryoma
"yes"
everyone (except for inui) can see Kaidoh's anger about to burst and don't know what to do when it does.

"But…"

"Um, inui"

"This does provide me with a good chance to observe how gender affects behavior, mental, and physical aspects of a person. As well as…"

"Inui-sempai"

"Yes"

"Where's your racket?" asks Kaidoh seething

"Hm, why?"

"So I can beat you to a bloody pulp" and proceeds to do just that. The others scramble to stop Kaidoh from killing Inui and destroying the bathroom in his attempts. Only to end up a tangled moving mass of flailing arms and legs. That moving mass despite the chaos inside managed to move out of the bathroom and back on the tennis courts, where Tezuka stands idle wondering where the regulars went off to. Tezuka turns around and sees a jumbled mass coming towards him. He moves out the way and the moving mass ran into the fence.

"Ack!" the regulars split with everyone landing on top of each other.

"What are you doing?" asked Tezuka whose looking a little ticked off at almost being crushed.

"Nya, we were trying to stop Kaidoh from killing Inui" cried Eiji as he got up from atop Oishi.

"Oh, so where is he? And who is that girl on top Momo?"

"ano" starts Taka

"What"

"Kaidoh is here just not in a way you would think. And this whole situation revolves around it" continues Oishi.

"Saa, that girl over there is Kaidoh" finished Fuji. At this Tezuka looked like he would be screaming "what?" at the top of his lungs while looking at said person. But because of his stoic disposition we all know that won't happen.

"Inui" Tezuka says just knowing who the culprit is. "What did you give to Kaidoh to make him like this? And there better be a cure because we have a practice match with rikkaidai at the end of the week."

Inui picks himself off the floor looking worse for wear despite the others attempts to help him. "I gave him my new juice which I haven't come up with a name for yet. And there seemed to be an added side effect. I don't even know if I'm able to come up with a cure in time." Kaidoh starts at this.

"Don't know. Don't know. You better know or else I'm defiantly burning your precious data. This is worse than the one juice that made me turn purple. Literally. I've had enough of this. I put my trust in you, I test your juice and 9 times out of 10 I end up in a bad situation."

"Wait, mamushi you've been testing his drinks for him" asks Momo with a mixed look of amazement and disgust.

"Sometimes but not anymore, after this I'm done" replies Kaidoh who's still pissed.

"Uh, mamushi"

"What" Kaidoh turns his attention down to the person underneath him.

"What's that thing on your back?" asks Momo who is looking a little more than scared. Kaidoh cranes his neck around to look. "Thing on my back? There's nothing on my back. If there were something on my back I would have felt iiiiiit…ACK! WHAT THE HELL IS THIS?"

The others (Tezuka included) moved over to where Momo and Kaidoh are and stared in shock. On his back was skin. Ok that was a little vague. On his back were scales similar to a snake starting from the shoulders to mid back.

"Kikumaru-sempai start a fire there's gonna be death"