Hey, this is my first fanfiction. This was an idea I had long ago. I hope you like it and please review. But please be gentle, english is my second language.

Arthur Pov

Arthur just stood there, watching his servant fighting the monsters. How could Merlin betray him like that? He was a sorcerer. His heart hurts. Why must every one he ever trusts betray him? First Morgana, she was like a sister to him and then Agravaine. His uncle, the only family he had left betrayed him. But he had always counted on Merlin. His betrayal hurts more than he could tell. Merlin finished the last monster, Morgana had sent him. All the knights were still fighting, no one seemed to notice what his servant had done. Merlin should pay for this.

Suddenly Merlin screamed:" Bae Yasmondras Quelnovra " towards him. He thought that now after he finds out the truth about Merlin he had to die. But instead of killing him, the light killed a Saxons. O shit! He forgot that there still fighting. Merlin looked at him. "We will discuss that later" Arthur said. Then he began to fight.

After a while everyone was defeated but Gwaine lies at the ground. Arthur and the other knights run towards him.

"Hold on, Gwaine", Leon said.

"Arthur we must bring him back to Camelot", Merlin said behind him.

How could he, still act like nothing ever happened? But he was right. How would his knights act when he would seize Merlin because of treachery? They won't believe him.

"Ready the horses. We need Gwaine bring to Gaius"

Merlin Pov

It happened during the attack from Morgana. Every day, he had been living with the risk of being exposed. Now Arthur discovered his secret. On the way back Arthur didn't spoke a word to Merlin. Now he ordered him to his chambers.

He knocked on the door and Arthur allowed him to come in. He looked really angry and Merlin was afraid of being executed.

Arthur started to yell: " How did you defeat the monsters?"
"You know" There was no point in denying it .
"How could you to this to me? Betray me like that. You know how evil magic is and if you weren't an enemy, you wouldn't have started to study magic."
"I am not your enemy, you know me for over 8 years now." Merlin knew he must prove to Arthur that he is not an enemy. But he couldn't think of something.
"Really Merlin? Do I know you? Everything you ever told me was a lie. You pretend to be someone you are not. You are evil."
"Wait Arthur"
"No, I won't listen anymore to you, sorcerer"
Then he screamed loud: " Guards, arrest him" Two guards entered the room and grabbed his arms.
"Please Arthur, you have to listen to me"
"Silent. Take him away."
The guards guide Merlin to the deepest and darkest part of the prison. When the guards left he began to cry.