The Doctor looked at Jack, a wicked gleam in his eyes. "Language, Jack," he said, smirking, though both his hearts were pounding wildly. "I'm starting think you might like me," he added, licking his lips.

He didn't know what he turning into, but he liked it, he liked the power he had over Jack. He was feeding on it, actually.

"When we're done here, Jack, back in the TARDIS, I'll give you all you ever wanted, but it might not be in ways you expect. Are you prepared for that?" he asked, almost breathless.