Celestial Reyvateil: Hello everyone to "The Secret's Out"! So please enjoy! Oh and this fanfic will start at T then move on to M.

Disclaimer: Celestiel Reyvateil doesn't own Durarara!, Harry Potter, nor any songs used in this fanfic. Only her OCs.

Pairings: Shizuo/Mikado/Izaya, Severus/Harry/OC, canon pairings, may have Sirius/Remus, and some OC pairings.

Chapter 1

Mikado froze as he turns his head to look at two familiar males, standing at the entrance of a door in shock. 'How did I end up in this situation?' Mikado thought as he replays the events in his head.

It all started when his brother's white owl came to his apartment to deliver a letter to him. In said letter, his brother wrote that he was immediately coming back to Japan to come check up on him, mom, and dad. The letter also said that things over at Wizarding England were now getting a bit hectic, after…He-Who-Must-Not-Be-Named has returned. His brother also wrote that he should be extra careful now (his brother doesn't know that Mikado is the leader of Dollars), just in case. Mikado then gave the owl some salmon and water, and sent the owl away.

What happened after the owl flew away and became barely visible in the bright blue sky. Was that Mikado wanted to go out for a stroll, but when he was about to leave he heard a crack sound behind him and paled. Mikado was about to whirl around to face his intruders, when one of them takes out a white cloth and promptly covers Mikado's mouth and nose with it. Immediately Mikado clenched a navy blue 12 pointed star pentacle pendent that had silver liquid flowing inside the star, and a bright light engulfs his apartment momentarily, causing his intruders to cover their eyes.

Mikado used this to his advantage when a dark blue staff appeared in his hand, and he casted a binding spell on the intruders. When the light dies down, his intruders were tied up with pale blue vines and pinned to either the floor or walls of his apartment. Mikado then counted that there were three intruders and before he could do anything else. His apartment door slams (or kicked) opened to reveal both Shizuo and Izaya. Shizuo and Izaya being here in his apartment, wasn't helping the situation Mikado was in, because last week both males confessed their love for the smaller male.

And now here he was holding a staff and three unknown people wearing black robes (and masks apparently) being pinned down to the floor and walls. Shizuo and Izaya just stare in shock for a few seconds and Izaya gazes at each intruder before his lips curled up into a grin, but not one of those happy grins, this grin was filled with malevolence aimed towards the intruders. Then Izaya turns his gaze towards Mikado and that malevolence grin turned soft and held no malevolence in it. "Mikado-chan~," Izaya said and Mikado could feel his body slowly relax. "Who are these people?" Izaya asked coolly yet worryingly.

"…" Mikado didn't reply at Izaya. Instead when Mikado's body was fully relax, he digs into one of his pockets on his pants, digs out his red cell phone, and dial a number.

A 20 year old woman with long black hair groaned when she hears an annoying ringing sound. Briefly doing a body stretch, the woman reaches over a coffee table and flips open a pale pink cell phone. "Hello..?" She said gruffly.

"Mizuki-senpai?" A male voice said and immediately she recognizes the voice, and gray eyes shot open as she sits straight up.

"Ah if it isn't Mikado-kun, is there something wrong?" Mizuki asked and she could hear something shuffling in the background.

"Um yes, can you call your mom? Because I have a little problem here in my apartment…" Mikado replied and Mizuki eyes slightly narrowed at what he said.

"Is something wrong?" Mizuki asked seriously. Mizuki hears a few groans in the background, and then hears someone kick in the background at something causing Mikado to grasp.

"Shizuo-san! Don't kick them!" Mikado shouted and Mizuki raised an eyebrow. However she shrugged it off and begins walking towards a large fireplace.

"Okay I'll call her right now," Mizuki said and grabs a handful of some kind of powder that was silver and glittery from an orange bowl that was on the fireplace mantel. "But if it's something serious, you do know that your father is going to freak out right?" Mizuki asked and heard a sigh.

"I know…" Mikado replied sighing heavily.

"Okay Mikado-chan, I hope everything is alright over there." Mizuki said and bids Mikado a 'good-bye', who also bids her a 'good-bye' before hanging up.

Mizuki puts down her cell phone on the fireplace mantel, and looks at the fireplace, "Hit Witch Sato Serena office!" she said and throws the powder into the fireplace. Immediately a green flame flared up and Mizuki stuck her head into the flames.

"Okaa-chan!" A woman with long dark brown hair and gray eyes almost jumped out of her chair when she heard a voice. The brunette turned her attention to the fireplace to see a female head appear in the flames, "Mizuki is something wrong?" she asked since Mizuki rarely uses the Floo Network to contact her.

"Okaa-chan, can you go to Mikado-kun's apartment?" Mizuki asked and her mom raised an eyebrow at her.

"Did something happen to Mikado?" Mizuki mom asked a bit worried.

"I don't know the details, but you know that Voldemort is…alive and back right?" Mizuki asked and her mom raised both of her eyebrows.

"Of course I do, it's all over the news here in the Wizarding World…Why do you ask that Mizuki?" Mizuki mom inquired.

"Because I think he might have something to do with what happened over at Mikado-kun's apartment." Mizuki replied and immediately her mom's eyes widened.

"Alright I'll go check on Mikado, and I'll also bring a few reinforcements too." Her mom said and Mizuki lets go a sigh of relief.

"Thank you okaa-chan." Mizuki said and with that her face disappears from the flames.

Mikado couldn't help but rub his forehead, feeling a headache arising. After Mikado stopped Shizuo from kicking any of the men, both he and Izaya just resorted to glaring daggers at them. Mikado was still holding his staff, and he could tell that Shizuo and Izaya were curious. However Mikado decided to not tell them just yet. Two full minutes passed in the uncomfortable silence when Mikado was the first to speak, "So…how did you two get here?" he asked and the two males look at him.

"It all started with Shizu-chan chasing me when we saw a blinding light coming from your apartment." Izaya said truthfully, which surprised Mikado for a bit since Izaya isn't exactly a nice person, but for some reason was nice and kind to him only.

Mikado turned to Shizuo for confirmation. Shizuo nodded at Mikado, "The damn flea is right." Shizuo admitted with a grunt.

Suddenly out of nowhere, all of them heard a crack sound causing Shizuo and Izaya to stand in front of Mikado protectively. Izaya had his switchblade in his right hand and Shizuo was ready to attack anything that dare to approach Mikado.

Sato Serena was expecting Mikado to politely greet her since the boy was nice to a default. However even though the black raven haired sapphire eyed boy rarely got angry, when someone managed to get him angry, they faced a wrath that could rival hell's own demons (Serena remembered the time when his mother told her that he stabbed someone with a Muggle pen). What greeted her and her colleges were two Muggle males ready to attack them.

Behind said males was Mikado, his raven black hair short, his skin pale white and his sapphire eyes were staring at her. Mikado wore blue jeans, and a green and white…what were they called again? 'Track sweater?' Serena thought trying to remember the type of clothes Muggles wore.

Then she turns her attention towards the two Muggles. The one with black hair and red auburn eyes was wearing a black jacket that had fur trim on it, and his pants and shirt were black. The other one, a man that had blond hair and mocha eyes, was wearing a white dress shirt with a black vest over the white dress shirt. He also wore black pants and had a black bow tie around the collar of the white dress shirt, and sunglasses that had the lens tinted blue. Both males looked to be in their early 20's.

The two Muggles glared at her and her colleges, getting ready to attack them if they did any sudden moment. However Mikado pushes his way between them and walks toward her, "Serena-san it's nice to meet you." He said and Serena smiles at him.

"I see that you're in good health Mikado." Serena replied.

Mikado then turns his head towards the two Muggles. "Don't worry they are not here to hurt or kidnap me." Mikado assured and at first the two Muggles were unsure, but never the less relax their body postures. The black haired Muggle puts the knife he held back into his black jacket, and he coldly stares at them; while the blond Muggle glares at them.

Serena then gazes at the black robed intruders, who were still bounded in Mikado's pale blue vines. "Unbind them Mikado," Serena said and Mikado nods. With a wave of his staff, the pale blue vines disappeared and the two black robed intruders that were pinned to the walls fell down. Her colleges promptly grabbed the intruders, and she took this chance to glance around Mikado's apartment. In her opinion his apartment was way too small for an average teenager to live in. His apartment consisted of a living room and a small kitchen area, with a window slightly covered with a teal curtain. "This…place is too small." Serena commented.

Mikado watched as Serena's colleges dragged the intruders to their feet. "There's an alleyway nearby." Mikado said and Serena colleges inclined their heads at him before they exit the apartment. Now Mikado's apartment felt less crowded, with only Mikado, Serena, and the two Muggles.

Serena turned to look at Mikado, "Mikado, your father will be here soon." Serena said and Mikado groaned inwardly. She glances toward the two Muggles, and then to Mikado. "So I would suggest you either Obliviate their memories of what just happened now, or do something else." Serena said and saunters out of the apartment and closes the door behind her, leaving the three males in silence.

Chapter 1 end

Celestial Revyateil: Please review/comment! Oh I should also mention that this fanfic is slightly AU since Mikado is here, at least on the Harry Potter world side.