After his father died under the unknown circumstances (you killed him) Edward became the king at only 18 years old.

His new power gave you an opportunity to use and manipulate him on your whim as he trusted you blindly as his advisor.

He would be furious and even threaten to execute anyone who dared to say something against you or say that you are wrong.

He was sitting on his throne and you were sitting on the armholder of it so you could whisper advices in his ear and always be close to him, you even stroked his hair and felt the power you had over him and the whole kingdom on your fingertips.