His informant had been correct.

Predictably, the door was locked when he reached his destination. Snape's hand travelled over the ancient wood, and in its wake the room beyond was revealed.

A dark head was visible over the foam that topped the prefect's bath.

At the far end of the room a lithe teenaged girl posed in a skirt too short for decency, especially from the angle her companion was watching. Her hair spilled over her back, glowing like a slow-burning fire in the candlelight. She lowered her blouse from her shoulders to show the virginal white bra, probably chosen by her mother.

Snape shifted awkwardly, adjusting himself as she undid the zip of her skirt and eased it over her hips until it fell around her bare feet. She performed for the boy, but as she turned, arms crossed over her breasts Snape knew she meant it for him, too. He could have sworn she stared straight at him with her bright green eyes, as she coquettishly bared the swell of her adolescent breasts, and reached behind her back to unfasten the damned cantilever contraption that pushed them up and together in such a provactive fashion.

One fingertip absently traced the bow of his lips as his other hand delved in his trouser pocket, alternately stroking and squeezing.

She played shy again once she let the wisp of fabric fall crossing her arms again to briefly hide her perfect— too large nipples. Snape grimaced, arranging his outer robes to conceal the last traces of his rapidly disappearing arousal and broke the scrying spell on the door.

With a barked word, he blew the door inward in time to catch Miss Weasley with her equally virginal knickers around her knees and Mister Corner taking himself in hand. "Fifty points from Gryffindor, Miss Weasley," he sneered. "And—" Snape fixed on the erection Corner floundered to conceal. "I suppose we cannot penalise Ravenclaw too much for such a small indiscretion. Ten points from Ravenclaw. I will advise Madam Pomfrey to expect you both in the hospital wing after breakfast on Saturday for a thorough medical followed by detention. Now, get dressed and go to your houses."

Snape waited until the two of them had run off in opposite directions to loose a sigh. Poppy would be glad of the help, the recent outbreak of stomach flu meant she was using an indecent number of bedpans. She would not only check both the children for STDs, but ensure that the girl took appropriate precautions to prevent pregnancy. Snape wasn't naive enough to think that this was either their first or last tryst, but if he had his way she at least wouldn't end up having pregnancy scares every other month. Like the real Lily.

Note: Used the Chamber of Secrets version of Ginny's eye colour. It doesn't become brown until DH.