"I think Koschei felt lost and angry when you left him behind. And when he became the Master, he lost sight of why he left Gallifrey in the first place. Instead of seeing the stars and remembering the pact, he became too busy burning them and trying to control it all. Back home, his family was in control and it was a life of servitude. So he rebelled... became what he wanted most: to be Master of his own life." Missy slicked back her hair and swam closer towards him until she stood directly in front of the Doctor again. "So now what? Where do we go from here, Doctor? What do you want to happen? Koschei and Theta Sigma had a pact, but we've both changed since then and that was a very, very long time ago. Tell me what you want."