The Doctor huffed out a deep breath of air, then fell silent for several moments to think about his answer. Really think. "I want us to be friends. And maybe something more?" He glanced at the Master and lifted his eyebrows - the crush the Doctor had since he was young still remained throughout the years, and in spite of all the misadventures and conflicts they'd had together - the time spent with Missy only scratched the surface. "But I don't want to be tied down." He knew it was a contradiction, but restrictions made him feel claustrophobic and antsy - the more he felt limited, the more his nature rebelled against it. "River seems to understand this, and maybe even to a certain extent, Jack, though we really haven't talked about it much. I'll still have my freedoms... and so should you."