No Air

Brown cloth billows, cold wind blows, snow falls. What may as well be a thousand miles away, the owner of his hearts unlocks the door to her apartment, and warm air billows outward. The Doctor tilts his head up, as if he can feel it, can still feel her touch. He can't. The thought takes his breath away; and now he pants, desperately, 'cause he swears, there's no air.

Good thing he has a respiratory bypass system.

Set near the end of "The End of Time" and inspired by "No Air" - specifially, the Glee Cast version.