It figures the Doctor would be utterly oblivious to any and/or all sexual advances that River Song might be throwing his way. As much as she liked having some time alone to cuddle, there's only so much stimulation she could get from something like that. "Well, Doctor..." She turns to face him and places a hand over the center of his chest, making sure to give him 'that' look as she leans in. That smoldering, flirtatious, seductive look that usually makes him uncomfortable.

"I can think of plenty of ways to pass that time." She murmurs, her lips mere inches from his. Making sure he can feel the weight of every word. "Can't you?"