Disclaimer: I do not own Doctor Who, though I really wish I did...
He smiled. Things were finally going to plan. Revenge would be sweet. He would face the world, wanting everyone to know the face of their tormentor. Death would become their constant companion.
He hid away, almost not wanting to face the world. He was full of life, and compassion, full of a childhood that never was.
He had a lust for revenge. A lust for power in order to inflict that revenge.
He had a lust for friendship.
He despised everyone who had made him suffer.
He understood the suffering.
He hated the one person who had caused his suffering.
He no longer could feel compassion for that one person, as hate filled him.
The hate filled them both, and made them stronger. So the two joined, the Time Lord and the Drums.
The drums became a part of him. Those violent drums, which drove an innocent child with so much compassion into something much more. The Master. No longer a friend to anyone but himself. Himself and the drums.