Bravery: I dont own Durarara or the characters no matter what. Even though I really wished that I owned Shizuo and Izaya~! Anyways please enjoy my first Shizaya story ^^

Chapter 1

A man with black hair and black eyes was walking down the street of Ikebukuro. He figured he could mess with Shizuo Heiwajima or as he liked to call him Shizu-chan. This man was named Izaya Orihara. Izaya always liked to go to Ikebukuro just because Shizuo was there. Since they were in high school they would always fight like they do now. Anyways enough about the past let talk about the present.

Izaya was heading to see Shinra and underground doctor. He got a phone call from Shinra asking him to come over and see him. Of course Izaya was suspicious but it gave him a great opportunity to go to Ikebukuro. 'IwonderwhatShizu-chanisupto' Izaya thought. He soon heard the same loud voice that he was used to every time he was here.

"IZAYA!" Shizuo yelled. Izaya smirked and soon felt the wind fly by his face. He looked at noticed a vending machine in the ground. He looked at Shizuo and smiled "Hello Shizu-chan. Already wanted to pick a fight, ne?" he said with a happy voice.

He thought about it "But, I can't play with you today. Bye bye Shizu-chan" he said as he turned and ran off.

Shizuo stood there and then quickly took after Izaya "I don't care if you have something to do here! Stay out of Ikebukuro!" he yelled. Izaya snickered and quickly ran losing Shizuo. He walked the rest of the way to Shinra's. Izaya knocked on the door and was quickly pulled inside.

Izaya pulled himself away from the underground doctor and glared "What do you need, Shinra? I am a very busy man" he said simply. He waited as Shinra explained what he wanted Izaya to do.

"So… You want to do an experiment on me?" he asked. Shinra nodded 'Yes, if you don't mind that is. It should be the long. It's a small dose of cat DNA. I want to see how well they mix up" said Shinra. Izaya stared and sighed "Why not? What harm could it cause me?" he said. He looked at Shinra asking for answers.

Shinra smiled "No harm at all. You might feel some strange effects during the process after I inject the cat DNA though" he answered. Izaya shook his head and was about to leave but he was pulled by the hood of his jacket to the operating room. Izaya struggled and tried to get away but he was placed on the bed and quickly injected with the DNA.

Shinra smiled "Process complete!" he said happily. He watched in thought as he waited for something to happen. Izaya glared at rubbed his arm where the needle entered. He frowned and waited as well.

Two Hours later still nothing. Shinra sighed in defeat and motioned Izaya to go "Celty should be here soon and I don't think you would want to face Shizuo right now…" he said. Izaya shrugged and placed his normal jacket back on "Bye Shinra." He said as he left the room and the home all together.

Now, Izaya seemed to be walking home. He was feeling some strange effects like wanting more fish and wanting to play with anything that involved yarn. He rubbed his eyes and shrugged. He continued on his was but stopped by to get some Russian Sushi just in case. Simon smiled "Oh! Izaya! Here for some sushi. Russian sushi better than other sushi" he said. Izaya only nodded and ordered some ootoro to go. When he was served it he quickly left since he wanted to eat it.

He smiled and skipped the rest of the way home but soon stopped when he smelt the scent of smoke. He looked up and saw Shizuo coming towards him.

Izaya smiled "Hello Shizu-chan~! Fancy seeing you here" he said. Shizuo glared "Shut up Flea! You know that I live around here!" he said. Izaya looked around "Really? I didn't know that" he said in an innocent voice. He actually did know that Shizuo lived around the area. He looked back to Shizuo but, Shizuo seemed to be staring at his head.

Izaya blinked and placed a hand on his head feeling two cat ears. Shizuo looked back to Izaya "Flea! What the hell are you doing walking around with those on!" he asked.

Izaya tugged on one of the ears and winced. He quickly took off and left Shizuo in the dust "FLEA!" Shizuo called but Izaya kept running. Shizuo watched Izaya run. He was confused as to why Izaya looked like a cat with the ears and even the tail. Shizuo felt his phone go off. He looked at the caller ID and saw that it was Shinra.

He opened it and answered "Hello?"

"Hey! Shizuo! I'm glad you picked up.I have a favor to ask.Could you watch Izaya for me? I gave him an injection earlier and I read on the bottle that it takes about two hours to take effect." Shinra asked.

Shizuo glared at his phone and placed it back to his ear "Why do I have to watch him! He is perfectly fine on his own. I just saw him. It was weird though, he had these cat ears and a tail. Did you have anything to do with that?"

Shinra only giggled "Uh...Oh Celty is calling me. I must go. Anyways thanks for agreeing!" he said nd quickly hung up the phone.

Shizuo looked at his phone and quickly walked to where he saw Izaya take off. He mumbled "Kill kill kill" the whole way. He seriously didn't want to have to look after the lea for the rest of his day.

Izaya on the other hand was catching his breath. He felt more agile and had better awareness of everything around him. He placed a hand on the ears and felt them. He soon started to purr lightly. He shook his head 'What am I doing? Stupid Shinra had to give me cat DNA. I will kill him for this!' he thought angrily.

He felt the tail and looked at it glaring. He knew something bad would happen. He knew he shouldn't have gone to Shinra's. He felt like he just signed his life away even though he didn't.

Izaya sighed and pulled his hood up to hide his ears but his tail was another story. He growled lightly and made the tail wrapped around his waist. He soon started to get the feel of having these new abilities and the ears along with the tail.

Izaya looked out of the alley both ways and walked out about ready to head to his home but was yanked back by his collar.

He coughed lightly and struggled to get out of the grip "Cut it out flea!" he heard someone say. He stopped and looked at the very angry Shizuo. He smiled "Hello Shizu-chan. Why are you here?" he asked.

Shizuo only glared "Shinra asked me to watch you. So that is what I am doing." He said. Izaya could hear in his voice that he wasn't happy about it. Izaya smiled "Aw~! Is Shizu-chan worried about me?" he asked happily.

He soon landed on the floor hard. He mewled in anger "Why did you do that you stupid protozoan!" he said. Shizuo smiled "I am only watching you not worrying or taking care of you" he said. Izaya frowned and got up off the floor and dusted himself off. He glared at Shizuo and walked away heading home.

Shizuo watched and soon followed. Izaya heard the footsteps and stopped "Don't follow me! I don't need you know where I live!" he said. Shizuo shrugged and only walked past Izaya "I already know where you live. Shinra gave me the address" he said. Izaya growled "Remind me to kill him even more" he said.

After the 30 minute walk they arrived at Izaya's home. Izaya walked inside first and heard Shizuo follow. Izaya wasn't happy he had no idea what Shizuo would do to him if they were in a room for too long together. He sighed and closed the door after Shizuo was inside having thoughts that a fight will break out 'Shizu-chan better not break anything.' He thought as the door was locked.