A/N:

I shouldn't be starting this fanfic story! I still have many fanfics I have to continue and finish up! So, why am I starting this one? I had the urge...big time!

Yes, this is my first AlvinxSimon fanfic story! I've only recently got into this shipping and I love it....no matter how wrong how it sounds.

If you've never read an AlvinxSimon fanfic before, I recommend you continue to read this one; you might actually like it, like I discovered with other AlvinxSimon fics.

Read and Enjoy! :)

DISCLAIMER: ALL CHARACTERS IN THIS FANFIC STORY BELONG TO ROSS BAGDASARIAN, SR. AND JANICE KARMAN.

WARNING: THIS FANFIC CONTAINS AN INTIMATE RELATIONSHIP BETWEEN BOTH MALE CHARCTERS, ALVIN AND SIMON. INCEST ISINTRODUCED IN THE LATER CHAPTERS. ENJOY!

Mischievous Experiments

Chapter 1
Mischievous Thoughts

A red-clad chipmunk with a red baseball cap on his furry head, smiled mischievously as he turned on the faucet, allowing water to rush out, and put a cup underneath the pour water, filling water into the cup. He turned the faucet off and placed the cup of water onto the counter.

It was a Saturday night and the three chipmunk brothers (Alvin, Simon and Theodore) were at home alone. Dave was out as he had an important meeting to attend to. Dave would have asked Miss Miller to look after his boys, but Miss Miller told Dave she was going out for a game of poker with her "gal pals", leaving the chipettes alone at their house in doing so. Dave couldn't get a last minute baby-sitter, so he had no other option but to leave his boys alone with no babysitter. He had left his phone number in the kitchen if anything would have to arise and had told his boys that the chipettes were only a few blocks down the road if they wanted to see them.

While Dave was out, the three chipmunk brothers found their own ways to entertain themselves for the night.

Theodore was in the living room, a plate of potato chips on his lap, as he sat and watched an episode of "Meer Cat Manor".

Simon had found peace and refuge from Alvin's mischievous antics down in the basement; he was busily working on an important experiment and didn't need any little (or big, depending how you see it), from his older and mischievous brother, Alvin. But Alvin had other ideas.....

Alvin was in the kitchen, the glass of water he had filled to the top, on the counter. He then put his paw into his pocket, searching and feeling for the thing he so badly needed for his plan to work. He felt a papery material and he knew, almost at once, he had found what he was looking for. He took out the sachet from his pocket, level to his eyes and read what was written on the packet: "STRONG LAXATIVE". Alvin smiled, tiered the top of the sachet and poured the whole contents of the sachet into the cup of water. He put a spoon into the cup and started to stir the murky substance, furiously, until the water was clear and the substance had dissolved.

Alvin smiled, picked up the cup of water, turned on his heel, and walked into the lit hallway. The door to his left, which lead down to the basement where Simon was likely to be doing some stupid experiment, was slightly open. Alvin entered through and closed the door behind him, a "click" sound being made as he did so. He descended the stairs being as quietly as possible, slowly, and stepping on his tiptoes. Alvin reached the bottom of the stairs and when he did, he turned his head and saw his target.

Simon was behind a large table, the table filled with apparatus and chemicals Alvin didn't even know the names of. It was badly lit in the basement, the only light source being the lamp that was on at the end of the table Simon was busily working on. A purple fume seemed to linger in the air and had the foulest smell Alvin had ever smelt. Though Alvin didn't bother to wonder what the fume was, for he had a plan that he had to achieve...

Alvin walked quietly in the direction where his younger and nerdy brother was pouring chemicals into beakers. Alvin wanted the element of surprise and he knew he would achieve it if he was as quiet as possible. Simon would be so startled by Alvin's awesome prank; it would be so hilarious to see Simon's face, Alvin couldn't wait to see it. But before Alvin could even shout out "Boo!", Simon said, in a low and dull voice:

"If you expected me to be startled by your pitiful prank, Alvin, I would suggest you work on being more quiet and not make yourself so obvious to your target," Simon didn't even turn around to look at him; he just continued to concentrate on his chemicals.

Alvin's mouth opened in surprise; he knew he was there that whole time! He just didn't say anything so he could make Alvin look like an idiot; to make him look stupid! He always did that to Alvin and it was one of the reasons why Simon bothered him so. Alvin cursed quietly under his breath, not for his own skills for being quiet, but more to the reason of Simon being so much smarter than himself!

"I wasn't trying to prank you, Simon!" Alvin said in a innocent voice, though he could tell Simon wasn't obviously believing him, for if he did, he would face Alvin and look into Alvin's auburn eyes and, almost, analyze Alvin's inner soul. That was another reason Simon bother Alvin so; Simon knew exactly what Alvin was up to, what he was thinking, like....there was a connection between the two of them. "I just wanted to give you this cup of water,"

"It's a prank," Simon said simply, still not turning to talk to Alvin directly....which was starting to bug Alvin a little. Simon continued his experiment, not acknowledging Alvin's presence, as if Alvin was a voice in his head.

"What!?" Alvin exclaimed, in a fake shocked and hurt voice. "Can't a brother give his little brother a drink?" Feeling rather annoyed that he was, almost, being ignored, Alvin went around the table Simon was working on, so Alvin could at least look Simon in the eyes. Maybe his eyes were more believable....the "cute innocent" look usually does the trick on Dave.....sometimes....

"A brother can make the curtsy of making their brother a drink, yes," Simon said, not even giving Alvin a glance. "But for you Alvin, I believe the rule does not apply to you,"

Alvin was by Simon's right side now.

"Oh come on, Si!" Alvin said in a joyful voice, giving Simon a punch on his shoulder blade. "A brother need to drink, doesn't he?"

Apparently, Alvin was a little too rough with punching Simon on the shoulder, for the chemicals in Simon's gloved hands splashed and dripped on the table in front of him, the splashing from the chemicals mixing with chemicals on the laid out table in front of the two boys. The fumes in the badly lit basement turned from a purple color to a sickly greyish color, almost instantly after the chemicals reacted with each other.

"Alvin!" Simon exclaimed in an angry voice, as he tried to stop the reaction which was taking place, adding a different chemical to the one that was reacting on the table in front of him. "Look what you've done!"

"I was just trying to help a brother!" Alvin retorted back, thinking he had done nothing at all. "You're thirsty, and you need to keep an eye out for your fluids,"

While Alvin ranted on about the importance of keeping hydrated, Simon continued to add chemicals to the one which was reacting. Fumes were erupting from it, smells too. Alvin didn't know what the heck he was doing but he ignored it all the same.

"And I hope you know how much water you should be drinking in a day...." Alvin continued to say, but he didn't finish his sentence, for the next thing he knew, he heard a loud "BANG!" which echoed off the walls, a slimy green substance had covered him and Simon and every other object in the room.

"Yuck!" Alvin said, as he wiped the green substance off of his clothes. "You just ruined my cap, Simon!" Alvin took off his beloved baseball cap and wiped the substance off, in an affectionate way.

"Your cap!?" Simon shouted, as he finally, properly, faced Alvin for the first time in which Alvin had entered the room. "You just ruined my experiment!"

"Oh, it was just an experiment, Si" Alvin said, waving his paw at Simon and his lame excuse for being angry with him. "You could always do another,"

"Do you know how long that took me to make!?" Simon shouted, gesturing to the slimy covered table and objects, an outrage expression on his face.

"A week?" Alvin said simply, teasing Simon with a smirk on his face. Alvin always did like to make Simon angry.....

"It took me three months!" Simon yelled, his body shaking with anger. "And you just ruined it, all of it, now, gone!"

"Your shaking Simon," Alvin pointed out, looking Simon up and down. "You should have a drink to calm your nerves...."

And in that quick moment, Alvin took the cup of water he had in his hands and splashed it into Simon's face, some of it entering Simon's mouth....but that was all Alvin needed. Simon started to sputter some of the water out. He took his glasses off and wiped them dry with a handkerchief he kept in his pocket. Once his glasses were dried, he put them back on and gave Alvin an outraged expression. Alvin merely smiled.

"Feel any better?" Alvin asked, a little nervous.

"No!" Simon yelled. "I don't feel any-" At that moment, Simon stopped abruptly. He put a hand to his stomach, his face going pale green. "I....I feel bad....."

"Really?" Alvin asked in a fake confused voice. "That's not what suppose to happen!"

"I....feel really bad....." Alvin jumped for joy in his head; he was hoping to hear something like that. Simon grabbed his stomach now with two hands.

"How strange....." Alvin said in a slow voice. But Alvin must have said too much, for Simon looked at Alvin with weak, angry eyes and said:

"It was you! You did this to me!"

"What!?" Alvin said in a fake startled voice. "What are you talking about?"

"Something you did.....that water you splashed on me!" Alvin cursed, yet agai, in his head; Simon was on to hi and if he found out what Alvin did.....

"I did no such thing!" Alvin put a paw to his heart as if he was hurt by Simon's words. "How could you even think I would do a thing to my own brother, you!"

"Easy," Simon answered, Alvin wondering if he knew it was a rhetorical question. "Your mischievous little rate who would do anything to anyone to get what you wanted,"

"I'm a chipmunk, actually," Alvin replied, chuckling a little at his joke. "I didn't do anything to you Simon, and you can't prove that I did otherwise; you have no proof!"

"That cup of water you splashed on to me is all the evidence I need!" Simon yelled, almost spitting at Alvin. "You did this and I know you did!"

Alvin felt it was time for him to go and to leave Simon with his own thoughts; he had done what he had planned to do and it had gone so perfectly. With Simon being sick, there was no chance you could go....

"Think what you like, Simon," Alvin said loudly as he walked in the direction of the stairs and started to climb. "I'm going upstairs to take a shower," But before Alvin took the last step, he turned and looked down at Simon and said:

"Oh, that is such a great look for you, Simon. I would defiantly think about keeping it," If Alvin wasn't mistaken, he could see Simon slightly blushing, his body shaking.

Those tickets are as good as mine, Alvin though mischievously as he left an angry, sick Simon to deal with his thoughts, alone in the basement.

A/N:

That's it for the first chapter.

Please bear in mind that this is the first chapter, so it may seem a little slow; it get's better in the next chapter!

I'm not sure if I like how this was written, though I think it could have been a lot worst.

Reviews will be most appreciated! If I have a lot of reviews, I will continue writing this story!

Please review! :)

See ya next update....that is, if I ever do update.