AN: I swear, I'm living on a rollercoaster at the moment. One minute I'm up, the next I'm down. Regardless, I write. I don't own the characters, I just play with them.

A smouldering glance across the crowded corridor was all it took, this time. Draco could feel his trousers getting tighter, and was grateful, once again, for the billowing black robes that were part of the Hogwarts uniform. She brushed against him, and her armful of books fell to the floor. He watched as she picked them up, firing a sharp comment in his direction.

"Watch where you're going, Malfoy."

"Perhaps you ought to be more careful."

The words were nothing unusual - typical of the sort they'd fired at each other since they started at the school. Now, though, it had an entirely different meaning. To them, it sounded like:

"Meet me in the Astronomy Tower."

"I'll be there in ten minutes."

She finished gathering her books, shot him a fierce glare, and stormed off. He smirked, and walked in the opposite direction. Being seen following her would ruin their carefully planned scheme. Besides, there were plenty of other ways to get to the Astronomy Tower.

.-.-.-.-.-.-.

She was there before him, her robe already discarded.

"Couldn't resist me, Granger?"

"Don't flatter yourself."

Two long strides and he was standing in front of her, almost but not quite touching. Slowly, he reached out and tugged sharply at the red ribbon holding her hair back. Brown curls tumbled down over her shoulders and around her face, the way he preferred. She ran her fingers through his hair before kissing him (as a concession to her, he'd stopped wearing hair gel a while ago).

They only had twenty minutes before their next class, so there was no time to waste. He slid one hand under her skirt and removed her knickers, while she unfastened his trousers. His belt dropped to the floor, but that was the only thing she removed completely. He pushed into her with a smooth movement, a practiced movement. They'd done this countless times before, and they both revelled in the thought of it being forbidden. Gryffindor and Slytherin, mudblood and pureblood, none of it mattered when they were like this, fucking each other's brains out in hidden places throughout the school.

It couldn't last, they both knew it and didn't care. She was going to have a glittering career in anything she happened to choose, and he was betrothed to a pureblooded witch. The wedding was arranged for the summer, soon after they left Hogwarts.

For now, thoughts of the future were far from their minds. The only thing they could concentrate on was the approaching climax. Hermione cried out, and he held her close as he followed suit. It took a few minutes for them to recover sufficiently to sort out their appearance. Hermione retrieved her knickers, a scrap of green silk. Draco smiled, approvingly.

"Slytherin colours, I like it."

"You would." She wasn't angry, though. She'd chosen them specifically for him. He couldn't help grimacing at the red ribbon in her hair. "I am a Gryffindor, Malfoy."

"I'm hardly likely to forget it. And you'll be late to class if you don't hurry up."

"Speak for yourself. I'm ready."

Adopting the disdainful expressions they usually wore around each other, they descended the staircase and rejoined the rest of the student population of Hogwarts, knowing their dirty little secret was safe for now.

AN: I have some vague ideas for turning this into a multi-chapter, if anybody's interested.