Side Effects

Author's Note: Hi guys! I just published my first novel Fons Vitae (on Amazon now under the name Destiny Aitsuji) and I thought I'll get back to write a few fan fictions. Hisoka is my favourite man and Killua is my favourite boy. In case you don't know what Doyen's Virility Pills are, Hunterpedia stated it makes a certain body part of your body more energetic with higher tolerance. Being the writer I am, what better ways to make yaoi out of something like that?

Introducing a Hisoka x Killua yaoi. Don't like, don't read. Also, review if you think it's cool ^^ [Don't forget to check my novel out on Amazon… it's guy x guy romance ignoring the fact they battle a 400 year old witch _]

-gets slapped for shameless self promoting-

Xxx Destiny Aitsuji xxX

"Woohoo! Killua look! We got the sixty-eighth card and with some spares too. These guys must really love Doyen's Virility Pills. I don't exactly blame them. It's like steroids after all."

The snow coloured hair bounced with every step the young assassin took. "Heh? I don't think it's worth being that excited over. I mean these guys are hunters and as hunters we should always train to become stronger. They are just cheaters when they depend on these pills."

Gon frowned as he considered Killua's words. It made sense but the raven haired boy was still curious about the effects.

"Come on Killua, aren't you curious about what it could do? I mean I could definitely beat you in arm wrestling with this."

The stubborn hunter waited for his best friend to take the bait. Killua was never one to back down from a challenge, especially from Gon. Many people say that Gon was naïve but sometimes, just sometimes, the child had more than just a few tricks up his sleeve. Killua on the other hand was easy to read when his guard was down.

Halting in his steps, Killua felt irritation build up from within him. That brat had the nerve to imply he could overpower him with a third rate drug? Oh, he was going to get it.

Just as Killua turned around, Gon felt a little burst of satisfaction but tried to maintain his poker face. It wouldn't do well if Killua backed out of his dare right now. He really wanted to see how much they could power up with the pills. They could always share seeing one bottle of pills contained five hundred pills.

"Oh? So that's what you're really after huh? I'll beat you without the drug! That'll show you not to underestimate me." The cat like expression tells Gon that his friend was up to something.

Gon nearly deflated at that conclusion. He had not been expecting it at all. An idea then struck Gon. A devilish grin nearly broke out on the innocent face but the boy kept it in. "Eh? That's not good, Killua. Let's make the deal first. I can take as many pills I want and neither of us will use Nen."

Killua frowned. "That's not fair Gon! At most you can take half. The other half will be mine if you can't beat me. It's only fair."

Ears perked at the mention of taking only half. Why would Killua want the other half now? It interested Gon a lot but he knew better than to ask his friend outright. Killua would never be honest about things like that. "I thought you said you weren't interested in them since they made you a cheater? Besides, why would you suddenly be so interested in them?"

Killua, having gotten caught, spluttered and blushed to the tip of his ears. "Wha-? That's not what I meant! I just didn't want you to get ahead of me again…"

"Eh?"

Killua took a look at his friend and was immediately reminded of how muscular Gon was. It just wasn't fair to Killua who trained a lot more than Gon. In fact, Killua had been trying to build up mass without success. The snowy haired boy had tone muscles but nothing impressive to his ultimate dismay. If anyone thought he had a complex about his scrawny appearance, they never mentioned it in fear of dying.

Day by day Killua watched his best friend become more of a man. There was nothing more depressing than seeing the gap between them grow. It feels as if Gon would soon surpass him and leave him behind even when Killua knew this was a product of his insecurities. Gon would never abandon him.

Choosing to change the subject, Killua then urged Gon to agree to his terms before he quit. Hastily, Gon agreed and they picked a location to arm wrestle. The desert seemed like a good place with plenty of rocks they could break for the times Gon wanted a rematch.

Once they reached the location, Gon had immediately wanted to chug down half the bottle but Killua reminded him, "They have side effects. Don't blame me if you end up dying."

Gon gulped and decided to take two, Killua observant of the reactions. True to what the pills claimed to do, Gon's arms started to buff a little. The biceps weren't as impressive as Killua's father but it was way more masculine than Killua's.

"Ready?" He asked. Gon was going down, pill or not. Killua could manage at least that.

Gon nodded, hazel eyes sparkled with excitement and determination.

The rock cracked a little when they applied force. It was a tie with neither of them able to overpower the other. If what two pills did to increase Gon's physical prowess were already so impressive, Killua couldn't wait to see what half a bottle of it would do. The tie went on for about two minutes with neither backing down. Killua felt the strain already and Gon was able to push Killua back a little more.

What neither of them expected was for the effects of the pill to wear off and vanish completely on the fifth minute. Gon went back to regular and Killua took that opportunity to seal his victory.

"Ha! Take that! I won Gon, now hand me that bottle."

Only a groan was heard as Gon passed his assassin friend the pills. Killua smirked at his victory and saved that precious bottle away. "Yosh! Let's go back then. I want to eat some choco robots to celebrate."

Only when Killua did not find Gon following after him did he turn around. There was Gon lying on the ground, unmoving. Worry enveloped the young hunter. "Gon?"

His friend did not respond and Killua bent down. A snore indicated that the usually energetic boy was merely sleeping. Killua gave a sigh of relief at that. The side effects were so different from person to person. The hunters they got the pills from were all groaning in pain from the use of the pill and then there was Gon, sleeping it off. This guy had all the best luck in the world.

Sighing, Killua carried his friend on his back all the way back to the hotel they were staying at while Bisuke went on her week of shopping. Killua decided that since he had some free time after dinner he might as well spend it testing the effects of the pills, preferably somewhere without people.

Xxx Destiny Aitsuji xxX

It was dark as Killua ran into the forest. There was a lake nearby and Killua can't wait to see the effects the pill had on his body. A small smile made its way to his face.

The lake came to view quickly and Killua rejoiced. Removing his shirt, Killua swallowed two pills and waited. Glancing back at his reflection in the water, Killua did not see anything different. He frowned. "Is it because of my conditioned body? Maybe I should try some more for faster effect."

Having said so, the boy swallowed a good handful. Twelve should be more than enough to determine the effectiveness of the pills. However as a minute passed, Killua growled in disappointment when no visible changes were made to his body. He did not spot biceps like Gon did and it was a major disappointment. The pills had to be fake, was what Killua decided. He was about to pick up his shirt and head back when his knees fell to the ground.

The world spun and became hazy for no apparent reason. Killua felt his normally slow heartbeat race faster than he remembered it could. Everything felt so hot and air could not enter his lungs fast enough. Was it the side effects already? This was ridiculous! The pills didn't work but the side effects did. "I want to demand a refund!"

First, the matter at hand.

With the remaining of his strength, Killua pulled himself to the edge of the lake. Cold water should help. His body felt like it was in a furnace and Killua had never felt anything like it before. He felt numb.

A loud splash was heard, alerting a man nearby. The moment Killua went underwater, the magician kept the cards he had been playing with. Curious, the red haired man went to check the source of the sound. When he reached the calm lake, nobody was in sight. Hisoka hummed thoughtfully to himself as he scanned the area.

A familiar long sleeved shirt was spotted and Hisoka raised an eyebrow, amused. Trying to look around for evidence of a certain boy who carried a fishing rod, the man was slightly disappointed. The assassin came alone. For what reasons though?

His question was quickly answered by a spluttering sound and flailing of arms in the water. Wasting no time, Hisoka dove in the pull the drowning boy out.

Once on land, Hisoka could see how flushed the boy was. He felt warmer than normal too. In any normal situation, Killua would have already prepared to fight with the magician. Although it was a pleasant change, Hisoka could not put a finger on what was wrong.

Small wet hands gripping at his blouse caught Hisoka's attention. "Hi…" a groan followed. The red head frowned. It sounded as if the boy was in excruciating pain from how heavily he was panting. His cheeks were flushed and body trembling.

"What's wrong?"

Killua tried to speak but only another moan escaped. Hisoka's eyes traveled down the pale and body to examine for injuries but what he discovered was something entirely different. In the boy's pants was a small tent. Golden eyes widened at the discovery as a sinister smile grew on his face.

Tracing a hand slowly up to the bulge, Hisoka palmed lightly and whispered lowly, "What do we have here? What had you been doing before I got here hm?"

Killua felt hands travel to his crotch and rub teasingly against his fabric. In normal situations he would have killed the man but his body betrayed him this time. A loud and wanton mean escaped his lips before he could register what had just occurred.

"No… don't! The pills…"

Hisoka glanced to where Killua's line of sight had fallen to and put two and two together. Killua must have consumed them out of curiosity or whatever reason. The side effects had been extreme arousal. Well, it didn't really matter what happened because Hisoka wasn't one to pass up an opportunity like this.

"Ne, Killua-kun do you know what you're going through right now?"

The boy in a muddle-headed state shook his head. He just knew he needed relief to remove that weird heat and pain. Another groan was heard when Hisoka gave his crotch a nice squeeze.

"Hnn~ Hisoka… please!"

Even when he didn't know what he was begging for, it seemed to help Hisoka make his mind up. The magician started to remove Killua's pants while briefly telling the assassin how it was a side effect called arousal. "Trust me alright? Let it all go tonight."

Numbly, Killua nodded and allowed Hisoka to remove all his clothes. Once naked, Killua bathed fully in moonlight. Hisoka licked his lips as he took a moment to appreciate the young boy's beauty. Even though he wasn't very muscular, Killua had nice tone muscles. His abs was a killer that many would die from envy. It was tone and well defined. Those pale ass cheeks were soft and supple, a complete contrast from the rock hard packs and junior that was already soaked in precum.

Deciding to put the main course on hold, Hisoka helped himself to appetiser. With a swift motion, Hisoka disappeared from Killua's line of sight. The boy had panicked a little but when he felt something warm enveloping his lower half, a scream was torn from his throat.

Writhing as Hisoka swirled his tongue over the tip, Killua tried to find something he could grab onto. The white hot pleasure coming from Hisoka's ministrations drove the young assassin crazy. He had never experienced something so intense and everything inside his head became a sea of white. How the magician played with his body, coaxing sweet moans with that skillful tongue made Killua a little desperate for something more.

Hisoka could feel the urgency in Killua but opted to keep his pace steady. His licked, sucked and teased the erection but never took it whole. He wanted to see those hips shake and hear that begging. Kissing the length, Hisoka teased, "Tell me what you want, Killua-kun."

Shuddering at the sex dripping voice, Killua whimpered. He felt the hot breath on his erection. "I don't know. I don't anymore Hisoka please! Please do something!"

The magician chuckled. The boy probably had not the faintest clue as to what sex was. He was still young after all. Going up to steal a tender kiss, Hisoka bore into blue eyes. "Don't worry. I'll take care of it all." Another peck on the forehead was made before Hisoka swallowed Killua whole.

Toes curled when Killua felt Hisoka deep throat him. The heat was unbearable and when the magician started hollowing his cheeks while bobbing up and down, it throw the boy over the edge. Toes curled and back arched, Killua gripped onto Hisoka's hair as if his life depended on it. A scream of Hisoka's name had the young boy falling over the edge.

Breathing heavily, Killua felt that the heat ebbed a little but the need was still strong. As Hisoka swallowed, he noticed how the dwindled erection was back to life. Chuckling to himself, he was silently glad. It was always great to be young, more fun for Hisoka.

Prying at Killua's lips, Hisoka told him to suck on them. Still dazed, Killua obeyed and made sure to lick those long digits while at it. The sight of a half lidded Killua made Hisoka's pants tight. He wanted to take the assassin right there and then but it would have to wait. The fruit was not ripe for the picking yet.

Pushing back and forth, Hisoka toyed with Killua's tongue. It was cute to see how Killua was so docile, unlike his usual self. The boy had the audacity to moan when Hisoka brushed the roof of his mouth. Deciding it was more than enough, Hisoka shifted their positions so Killua was on his knees with butt in the air. The new position was embarrassing and Killua had squirmed.

Having none of it, Hisoka gave the pert bottom a light warning smack. The contact made Killua groan and the squirming ceased. Satisfied with the view, Hisoka eased on finger into Killua. The boy felt the foreign intrusion but did not let it hinder him. It wasn't painful but not exactly comfortable either. Only when Hisoka started to thrust the finger in and out did Killua relax a little more.

Seeing how the assassin had gotten used to the feeling, Hisoka added another finger in to stretch the boy. This time a visible frown was seen but Hisoka didn't stop. It might take a while but once Hisoka found that special spot, the boy would have no problem adapting.

Scissoring past the tight ring of muscles, Hisoka thrusts his fingers inside of Killua to search for that magical place. It took a few attempts but when Hisoka curled his fingers up to the right position, Killua screamed and spasmed. "Hisoka…" the boy was breathless, eyes wide. "What was tha-?"

Unable to complete his sentence when Hisoka nudged against the spot, Killua could only moan. Grinning in victory, the magician ensured to abuse the spot until the boy was a mess of moans and tears. The erection was now dripping with precum once more and Hisoka decided to try something more.

Adjusting their position, Hisoka had Killua on his back again with legs spread apart. Without another word, the fingers were back. Hisoka added a third and before Killua could tense up in pain, the man bent down, taking Killua whole. The sudden pain was reduced to nothing when the warm cavern engulfed Killua's manhood once again. It took everything the snowy haired boy to remember how to breathe as he reached his high for the second time that night. The magician was a natural seductress.

Drinking all of Killua's essence, Hisoka looked up to see the boy looking thoroughly disheveled. The erection did not wean and Hisoka smiled. Now that the fruit was ready for picking, he wasn't going to hold back.

Clothes fell off as Hisoka made quick work of them. Buck naked, the man approached Killua once more and they engaged in a heated make out session. The boy felt the red haired man's excitement prodding at his entrance but was too distracted by the tongue in his mouth to understand what was happening.

Hisoka took the opportunity to sheath himself fully when Killua was unguarded. A scream of pain was swallowed up by Hisoka who did his best to distract the boy from pain. A hand snuck up to pump the neglected length while the other pinched a hardened nub.

Killua felt pleasure course through him, distracting from the length that was inside of him. The pain threatened to break him into half but Hisoka was an experienced lover. He knew how to control both pain and pleasure, something Killua was still trying to grasp basic understanding of. His body betrayed him and acted according to Hisoka's actions.

The magician sensed the rational thoughts coming back to Killua and tsked. This simply won't do. He then grabbed the boy by his hips and gave an experimental thrust. The small movement had sent the boy gasping. Hisoka grinned and made it his goal to hit abuse the prostate with every coming home.

The first thrust had Killua arching his back but the subsequent ones stole his breath away. Hisoka's kisses sucked away his soul and his mind for all that matter. The incessant poundings to Killua's prostate weren't helping either. Killua knew that he was a goner, swept with the wave and taken on a ride.

"Killua…" the man had groaned as he felt himself going deeper into the boy who was wailing at every time his prostate was struck.

The sound of skin slapping skin excited the magician to no ends. Skilful hands did not remain idle as they started pumping the boy's length again while exploring other places of the lithe body. Hisoka found his tongue travelling down to the slender neck and leaving a trial of kiss marks in its wake.

Unable to handle the overload of pleasure, Killua came undone for the third time with Hisoka still going at a steady pace. The psychotic smile on the man's face spoke otherwise though.

"Oh Killua…" he moaned and Killua shuddered. "Killua, say my name."

The assassin could only moan as the man continued to hammer home. "No… No more please… I can't."

"Please Killua. Say my name," the whisper had been so tender and Killua found himself melting once again. That man was dangerous. Then again, his train of thoughts disappeared when he looked into golden eyes.

"Hisoka…"

Satisfied, the man smiled and increased his pace, causing the young assassin to cry out in pleasure. It didn't take long for them to hit the highs.

Xxx Destiny Aitsuji xxX

Morning came and Killua found himself alone. He was dressed and lying on the ground near the lake. Last night had been so surreal he didn't know what to believe anymore. The one thing that reminded him of Hisoka's skilful bedroom skills had been the note lying beneath the bottle of pills. Hisoka's signature emoticon seemed to wink at him. Frowning, the assassin crushed it, ready to throw it away but somehow he couldn't bring himself to do it.

Full blush on his pale cheeks, Killua convinced himself it was not good to litter while stuffing the crumpled note into his pants pocket with the bottle of pills.

The magician watched the assassin mumble to himself from across the lake. It had truly been a passionate night. After a taste of the forbidden fruit, Hisoka was addicted and wanted a second taste. The only problem was how to explain it all to a certain overprotective big brother when they got out of Greed Island?

Xxx Destiny Aitsuji xxX

Author's Note: Thank you so much! Please review and don't forget to check out my book Fons Vitae!

Destiny Aitsuji signing off ~