In dark corners on the Hogwarts Express

Hermione has just been named head girl by her professor on the Hogwarts Express. She takes a detour to the luggage compartment and is surprised by a chance encounter by the one person she never wanted to be caught in a confined space with. How will they survive the rest of the eight hour trip together?

Oneshot, smut for mature audience. As close to characters as I could get apart from the swearing. Storyline is altered- no war, no Voldy and Dracos father is in Azkaban for other reasons.
I do not own the rights to HP characters - only the story thought up.