Inui's Special Enhancing Drink

Summary: When Inui makes a new drink, he decides to make Ryoma his test subject. However, the side effects of the drink causes Ryoma to change entirely! While Inui investigates the cure, he leaves it to Fuji to take care of Ryoma, but what happens when the new Ryoma proves to be a little too much for Fuji to handle? He might just lose all control. YAOI, PWP. Mature content! Thrill pair. One-shot.

Inui's Special Enhancing Drink

Ryoma knew the moment he entered the lab, he should have turned and left immediately. The awful smell and dark aura he felt was an immediate warning for him to stay away. His golden eyes drifted to the bubbling drink in the tube glass that was being brewed by one of the burner. Inui stood behind it with grinning smile that looked all too creepy. Ryoma took a step back and shook his head. “No,” he said firmly as he tried to make a run for it, but Inui was quick. Ryoma felt Inui's hand on his arms and soon he was being dragged away fro the door. Ryoma kicked and struggled, trying to pry from Inui's strong grip, but unfortunately, he failed. He was pushed down to sit on a chair as Inui went on to explain the drink.

“This is my newest creation, Inui's Special Enhancing Drink. It's suppose to help your body and provides all the nutrients you need,” he said, “And...I want you to be the first to try.”

“I don't want to. Make Fuji-sempai. He seems to be immune to your drinks,” Ryoma said with a glare.

“But I made his drink specifically to fit you. So, try it!”

Inui handed him one of the tube while smiling. Ryoma stared at the drink and sighed in defeat. He took the glass tube from Inui and stared at the pitch black drink. It was bubbling and he swore, he saw something move inside of it. Closing his eyes, he prayed that nothing would happened. He raised the glass and nearly puked the putrid smell. Holding his breath, raised the glass tube to his lips and lifted it. He gulped the drink down in one swig. A shudder ran through his body as he felt his body grow hot. A shaky sigh escape his lips as sweat beaded down his forehead. His body was aching. Moaning, he fell onto the floor. A shadow loomed over him and he could hear Inui's voice calling out to him, but he couldn't answer. He pain was too much, causing him to black out.

Fuji was walking down the hallway when the lab door slid open with a loud thud, jolting him from his train of thoughts. Blinking, he turned his head and looked over to the disheveled figure which he recognized as Inui. “Inui?” Fuji called out as he approached the glassed man.

Inui quickly glanced up at his name and smiled with relief, “Fuji! Just the person I was looking for. Look, I made Ryoma try out my new drink-”

“And you decided not to ask me to try it? You know I like trying your new drinks.”

“Not this one...no...you definitely do not want to try this one. Uh, but look. I need you to look after Echizen. Do not, and I mean it, do not let him leave this room.”

“Why?”

“You can uh...see it for yourself. I have to...um...look for a cure. So, just watch him! And remember, don't let him leave.”

Inui took off in a run, leaving Fuji behind to deal with the mess. Curious as to why Inui was fretting over such a thing, Fuji entered the lab and slid the door. He turned ask Ryoma what was going on, but found the room empty. Fuji frowned slightly and walked around the room. “Echizen?” he called, “Are you here?” A noise from the left side of the room caught his attention. He turned on his heel and gasped at the sight of Ryoma. Before his very eyes was a Ryoma with cat ears and cat tails, cowering under one of the tables with tears prickling the side of his eyes and a flush that colored his face. “Echi...zen?” Fuji said again, shocked.

“Nnn...yes, nya?” Ryoma replied with a cat like noise.

“N...nya?” Fuji repeated, still shocked.

“Nya? What? Am I that...horrible looking? Uwaaah, I knew I should have ran away when I saw what Inui-sempai was up to.”

Fuji's eyes wideneed as Ryoma started to sob. This was...so unlike Ryoma. Stifling a laugh, he walked over to Ryoma and squatted down in front of him. He held his hand out to Ryoma and cooed, “It's okay. You look fine. You're very...adorable,” Fuji said.

“You're just saying that to make me feel better! Nnn...I hate Inui-sempai!” Ryoma cried as he buried his face into the palm of his hands.

“Shhh, it's okay,” Fuji cooed again as he reached under the table and pulled Ryoma out.

“...Fuji-sempai!” Ryoma sniffled as he tackled him down, “Nya...waahhh...I can't believe I have cat ears, nya! Fuji-sempai! What if they don't go away? How will I play tennis now? Nya! And I can't stop saying “nya,” nya.”

Fuji burst into a fit of giggles, unable to control his laughter anymore. He felt the small thumpings of Ryoma's fist against his chest, which only caused him to laugh some more. Wiping the tears away, he held Ryoma's hand to prevent him from hitting. “I'm...I'm sorry Echizen. It's just...you're so cute right now!”

Ryoma pouted at him, pulling his hands away. Fuji watched with amusement as Ryoma crossed his arms across his chest. Not only had his look changed, but his personality as well. He had become...moe! So cute that he wanted to just...to just fuck him right there. Fuji blinked, startled from his thought. Shaking his head, he chuckled to himself. No, he did not just think that he wanted to ravish his own kohai, especially when he could be easily taken advantage of. Easily...taken...advantage of, yumm...Fuji shook his head again, preventing his thoughts to rift any farther. If he wanted to stay sane, he needed to get away from Ryoma. Standing up, he helped Ryoma up. “Why don't you take a seat and calm down?” Fuji asked, “Inui will be back soon with a cure, I'm sure of it.”

Ryoma nodded obediently and sat down in one of the seat. His tail swished back forth, causing Fuji to stare at it. His gaze drifted farther down and landed on Ryoma's cute butt. He licked his lips, imagining what it would be like if his co- Fuji quickly away and mentally scolded himself. He needed to stop his imagination.

“Fuji-sempai, nya?” Ryoma called out in a quiet and shy voice.

“Yes?” Fuji answered, returning his gaze to Ryoma's face. However, staring at Ryoma's face didn't make things better. He got a full view of Ryoma and his cat ears which was twitching slightly. He gulped slowly, forcing himself to think of other things that weren't...perverted.

“Fuji-sempai...my...my thingy feel funny,” Ryoma said, tilting his head with big, watery eyes.

“Your what?' Fuji asked in shock.

“My...my thingy!” Ryoma said, fidgeting in his seat as he pressed his legs tightly together.

“Your...thingy...”

Fuji dropped his gaze and stared at the bulge in Ryoma's pants. No, it wasn't possible. How could Ryoma be...turned on? Fuji nearly swooned at the sight and thought. Suddenly, he heard the mewling of cats from outside the window. That's when it hit him. Ryoma was probably in his mating season...well, cat form, he was. Fuji gulped and chuckled sheepishly to himself. He would be unable to hold back if this went any longer. He cursed Inui for leaving him behind and then he began to wonder why it was taking Inui so long to find the cure. “Well, Echizen....it seems that...you are in your...mating season,” Fuji said.

“Mating season? But I'm not even a cat, nya!” Ryoma said with teary eyes.

“Ah, but I guess...Inui's drink must have changed your biological aspect as well.”

“Nnnn...Fuji-sempai...nya...my thingy is getting uncomfortable!” Ryoma said, “please help me!”

“Eh?! No...Echizen, I can't...I can't take advantage of you like this.”

“But...but...you're only helping me, nya! Please! It's...mmmnya!” Ryoma pleaded as he suddenly leaned over the desk and started humping it.

Everything inside his head went off in an alarm, but Fuji was already long gone from being rational. He wanted Ryoma and he wanted the boy now. Growling, he yanked Ryoma by the collar and pulled him into a rough kiss. His tongue thrust into Ryom'as mouth at the first chance he could get. He lick and stroked Ryoma's tongue until the younger boy was shaking at the knees and unable to stand straight. Pulling away from the kiss, he trailed his mouth down Ryoma's jaw. He nipped the boy's chin and then trailed his lips down to Ryoma's neck. Sucking and biting, he left behind many marks in visible places, wanting to claim Ryoma as his. Growling again, Fuji quickly stripped Ryoma of his clothes, tossing them aside. He could hear Ryoma whimpering as he turned him over, making him bend over the desk. Licking his lips, he unzipped his pants and tugged his boxers down. He rubbed his already aching cock against the crack of Ryoma's ass slowly. With one hand, he reached under Ryoma and started to stroke his penis. Fuji smirked at the sound of Ryoma's pleasuring cry as he pushed himself against the desk. Fuji ran his hand down the base of the shaft and back up, stopping at the tip to rub at the slit where precum was already forming.

“Ahnnn, nya! Fuji-sempai! Ah, ah...nnn, please...stop rubbing nya!” Ryoma pleaded desperately.

“Not yet,” Fuji said as he stroked faster while hastening the movement of his rotataing hips to slide his cock faster against Ryoma. Chuckling, he pushed Ryoma's legs open with his knees. Sliding his hard cock in between Ryoma's thighs, he commanded the younger boy to close his thighs around him. Ryoma nodded and did as he was told. A shaky sigh came out in a short gasp as Fuji felt the pressure around his length. With his precum acting as lube, he began to slide his length in and out of Ryoma's thighs, brushing against his kohai's balls each time he thrust.

“Nnyyaa...ahhh,” Ryoma moaned, “Fuji...sem...pai, nya!”

Gritting his teeth to will himself away from Ryoma, he pulled away and leaned over the younger male to whisper into his ear, “Why don't you prepare yourself for me?”

“Pre...pare?” Ryoma asked with a puzzled look.

“Yes, you know, right here...stretch yourself,” Fuji whispered huskily as he ran his index finger over the puckering hole of Ryoma's ass.

Ryoma arched his back and whimpered into his arms. Fuji waited, smirking. He flicked his tongue out, licking Ryoma's earlobes, “I'll wait till you prepare yourself.”

The sudden shift from the younger boy made him laugh in a low tone. He took a step back and watched as Ryoma sucked two of his fingers. Fuji licked his lips, gazing at Ryoma as he flicked his tongue between his fingers, licking between them and then sucking them noisily. When they were wet enough, Ryoma reached behind him, whimpering as he pressed one of his finger against his hole. He cried out as the finger pressed inside. His body shook as it adjusted to the pain. He waited for a minute before he started to thrust his finger in and out, setting a slow rhythm for himself as he began to feel the pleasure. He was mewling in delight, but it wasn't enough.

“Add another,” Fuji commanded.

Fuji smiled when Ryoma looked over his shoulder at him and nodded. He added his second finger, hissing in pain. He waited again like the first time before he started moving. “Move in a scissoring action,” Fuji said and just as he directed, the boy did just as he was told. He was panting by the time Fuji couldn't wait anymore. “Okay, stop,” Fuji said, “I'm going to enter you now, but I need you to prepare me.”

“Please,” Ryoma begged, “I...I want to feel you...inside me.”

Smirking, Fuji stepped forward. He pulled Ryoma off the table and made him kneel. He looked down at Ryoma, nudging his raging hard on against the boy's lips. Ryoma glanced up from under his eyelashes as he opened his mouth and closed it around the tip of the cock. Fuji hummed in content as Ryoma began to bob his head up and down, swirling his tongue around the tip. He made a shallow thrust into Ryoma's mouth, causing Ryoma to take him deeper. A soft moan came from Ryoma as he began to take Fuji's cock deeper into his throat. Grunting, Fuji began to thrust into Ryoma's mouth, “Make sure you make it nice and wet.” Ryoma muffled a “yes” as he released the cock with a pop and started to lick it up and down. Once his cock was fully covered in Ryoma's saliva, he tugged the boy up and bent him over the desk again. Stretching Ryoma's butt cheeks, he pressed his cock against the pink hole. He pushed against the hole, hissing at the feel of his head being enveloped by heat. He gasped as he pushed deeper. From below him, he could hear Ryoma crying.

“It hurts,” Ryoma sobbed.

“Shhh, it'll feel better,” Fuji said as he pushed on. When his cock was covered to the hilt, he paused and waited till Ryoma stopped sobbing. “Better?”

Ryoma nodded, “You can move now.”

Just as Ryoma said, Fuji began to move, thrusting in slow, setting a rhythm for Ryoma to get use to. However, the slow paced thrust was beginning to take a toll. He wanted more. He wanted to fuck Ryoma until he was begging him to go harder.

“Fuji-sempai...nya...ahhhnnn nya! Please...more! I want more! Don't be gentle!” Ryoma said.

His words were the last straw. A low growl bellowed from his stomach as he pulled Ryoma off the desk and pushed him against the floor without pulling out. He pushed Ryoma's torso to the floor, leaving Ryoma's ass raised in the air. Pushing his butt cheeks apart, Fuji thrust into Ryoma hard and fast, causing their skin to slap against each other. He continued to ram into Ryoma as he begged him to go faster. Gritting his teeth, he pulled out and flipped Ryoma over onto his back. Lifting the other's legs up, he spread Ryoma's legs and thrust back into him. Gasping, Fuji started thrusting again, moving desperately, trying to find Ryoma's sweet spot. His fast thrusting eventually found Ryoma sweet spot and he took advantage of it, thrusting into over and over until Ryoma was crying out his name. He didn't care if anybody could hear them or if anyone walked in on them. He was going to fuck Ryoma senseless. Turning Ryoma onto his side, he lifted one of Ryoma's leg over his shoulder as the other laid against the floor. He pushed deeper into Ryoma, grunting as he did. He rotated his hips, grinding deep into Ryoma before pulling and thrusting back in to repeat the same motion.

“Ah, ah...nya! Nnnnnya! Oh...Fu...ji..sem...pai! Nyaaa, I'm com..ing!” Ryoma let out a loud moan as he ejaculated, spilling streams of milky cream over chest and the floor.

Fuji continued to thrust until Ryoma was done. He pulled out, still hard and unsatisfied. He was about to jack himself off when Ryoma suddenly dove between his legs. Gasping at the sudden hot, wetness of Ryoma's mouth on his cock, he thrust into the cavern. Moaning, he grasped onto Ryoma's hair and started a swift thrust into Ryoma's mouth as his tongue expertly swirled around his throbbing cock. Ryoma deep throated him, causing him to moan loudly. Where the hell did he learn this? Fuji thought, but the thought only flashed through his head for a brief moment before he was taken over by the powerful suction of Ryoma's mouth that was bobbing up and down his shaft. “Shhi...Echizen...stop...I'm...I'm going to come!” he yelled just as his body spasmed.

He tried to pull Ryoma away, but Ryoma held on tight to his hips. Ryoma kept his mouth over his cock, taking in all the cum that he was spilling. Fuji gasped as his body shook. When his orgasm was over, he looked down at Ryoma, noticing the overflow of his own cum as it slid down Ryoma's chin and his own penis. Ryoma released his sensitive cock and swallowed the rest of the cum that was in his mouth. It was probably the sexiest sight Fuji ever saw. He reached a hand out, placing it around Ryoma's neck as he pulled the boy in for a kiss. He could taste himself on Ryoma's tongue, a bitter and salty taste. Ryoma slid into his lap, rubbing and grinding against him. Just as things were about to get heated again, the door suddenly slid open.

“I found the cure!” Inui yelled.

Fuji pulled away from the kiss quickly and cursed under his breath, “Um...hey, Inui...” He wasn't sure as to how he would explain the scene.

“Oh, looks like you already found the cure,” Inui said.

“What?”

“You know...the cure was ejaculating into Ryoma's mouth and making him swallow it.”

“What?!”

“Like I said. You make Ryoma swallow your sperm, your seed, your cu-”

“I get it! I just don't get why the hell is that the cure?!”

“Who knows...”

“......and how did you find out?”

“Ah...well, that...ehehehe...”

“Inui-sempai?” Kaidoh's voice echoed from behind him, “I...I want some...more.”

Fuji stared as a red blush formed across Inui's face. “Hooh? So you decided to use two subjects?”

“Um...you should get cleaned up. I'm...I'm going to take Kaidoh home,” Inui said quickly as he dragged a very disheveled Kaidoh away.

Sighing, Fuji ran his fingers through hair. Suddenly, he felt Ryoma nuzzling against his neck. He glanced down, taking note that Ryoma's cat ears and tails were definitely gone. A pang of guilt ran through him. Even though he knew that the cure was a blowjob with Ryoma swallowing his cum, he still felt horribl for taking advantage of the boy. “Echizen?” Fuji whispered, “Are you okay?”

“Mmmm...yeah,” Ryoma replied sleepily.

“Um, about what happened...you must remember right?”

“...yeah.”

“Look, I'm...I'm sorry. I-”

Fuji never finished his sentence. Instead, he felt Ryoma's soft lips pressing against his. As Ryoma leaned away, Fuji stared at him in surprise, “...Wha-”

“I didn't mind it...I...enjoyed it. I wouldn't mind doing it again...without Inui's drink,” Ryoma said quietly, “If you...don't mind, I mean.”

Smiling slowly, Fuji leaned in for another kiss, flicking his tongue and running it across Ryoma's bottom lips, “Of course I don't mind. Want to come over to my house tonight? No one will be home...so you can be as loud as you want.”

Ryoma glared and then said, “I'm not going to be that loud. But...I'll come over.”

Fuji chuckled and kissed Ryoma's forehead. Maybe he should thank Inui since he just received a wonderful gift.