The Master didn't fluster easily, but a groan of inarticulate longing did escape him. River certainly knew how to press his buttons-- so many others would refuse to use his real name once learnt. But she... she reveled in saying it.

He pressed forward even further, grinding into her so that he could reach and unlock the handcuffs. With a click they came apart.

"There," he whispered into her ear. "Now. How are you going to repay me?"