Disclaimer: I don't not own Durarara! Or the vocaloids. This is a fan fiction made purely for the enjoyment of others.

This is based off of vocaloids Rin & Len's Aku no series. Consisting of the songs;

Daughter of Evil (Aku no Musume) video link:

Servant of Evil (Aku no Meshitsukai) video link:

Message of Regret video link:

This fan fiction features the Durarara! characters; Orihara Izaya, Psyche, Heiwajima Shizuo, Tsugaru, and other miscellaneous cameos.

This story was actually inspired by Izaya Orihara's (Limone-sensei) cover of Servant of Evil here:

Aku no Meshitsukai

He is the prince, and he is the servant. Destiny separated such pitiful twins. The young servant would sacrifice everything, if for the sake of protecting him, then he would even become evil.

If that is what it took.

Psyche watched as his brother played with the wide assortment of colored blocks. They were young, being only the age of six, and spent everyday playing together.

Psyche loved his brother, always so curious and adventurous, and watching over him was something that he had always done. No one had ever told him to do so, but no matter what, Psyche wanted nothing more that to protect his cute sibling, from whatever harm may come to him. He vowed to always do so, until the day he died.

They were born into high expectations, as the church bells blessed their birth, their futures were split in two. For the convenience of selfish adults.

"Iza-chan, come on! Lets go play outside!" Psyche chirped happily.

He grabbed his brothers hand as he led him to the door of their room. They smiled and laughed everyday, more than happy spending their lives together.

"Psyche-chan! Wait for me! You're running to fast!" Izaya called after his energetic brother.

Psyche smiled, his teeth showing, as he grinned from ear to ear.

"Silly Iza-chan~!" He sang happily.

They played just as other children did, their lives filled to the brim with happiness as they grew more and more each day.

It wasn't until they had turned eight, that Psyche had become aware of the one difference they had.

Master and Servant.

Psyche hated it. And when they took his precious brother away from him, he lost all control of himself.

"NO!" He shouted as the servants held him back.

Izaya struggled with all his might to break free from the ministers grasp, kicking and screaming, completely terrified as they ripped the brothers relationship apart.

"Iza-chan! No, let him go!" Psyche cried, trying his hardest to get to his distraught brother.

Izaya was to be ruler of their land, and as they saw it, Psyche was the only distraction from obtaining their goal.

If they separate them, they could mold Izaya into the being they wanted him to be.

For four long years, Psyche was forbidden to see Izaya. Missing the moments of Izaya's life he had so longed to see. And now, he knew nothing about his brother.

When they were reunited, Psyche cried tears of joy upon the very sight of his brother, and Izaya, looked at him with disgust.

"I-Iza-chan?" Psyche said nervously.

This person…was not his brother…who is it?

Izaya scowled angrily, crossing his arms, and standing up straight as the large doors separating he and his brother slowly began to close.

"What a ridiculous name."

Was all he said before the doors closed.

The wedge between them growing ever larger.

From then on, Psyche became nothing more than another one of Izaya's servants. He was forbidden to call him anything but Izaya-sama, or simply, master.

And he hated it. Despised it.

Izaya had changed, they changed him, his precious brother. His brother that he had loved so much, that looked at him with such sweet innocent eyes, now looked at him with anger and disgust. It wasn't fair.

Psyche cried.

Psyche began once again to spend everyday with his beloved brother. Eventually, Izaya had once again become used to Psyche's presence, and yet, they never once spent a day as simple brothers.

Psyche watched as everyday his brother became even more stunningly beautiful, and all the more corrupt. Raising taxes, waging wars, even torturing the towns people. As Psyche watched, he never became angry with his brother for what he had done, not once.

He vowed since they were children to always protect Izaya. Always.

Even if all the world became his enemy, he promised, to always protect him.

For all he wanted, was to see him smile.

He is the prince, and he is the servant. That is something that will never change.

Destiny separated those pitiful twins.

If it was for the sake of protecting him, then he would even become evil.

If that's what it took.

Authors note's:

The first chapter of Aku no Meshitsukai is done! XD I really enjoy writing this story, I don't know why, its just really fun. ^^ Poor Psyche gets to tell his sad tale now. T^T sad face…

Any and all reviews are greatly appreciated! Constructive criticism is always helpful! Thank you!