Author's Note: The M rating is for this chapter, so sorry smut fans, this story will be more fluff. If that's not your cup of tea, hit the back button, otherwise enjoy!
Harry sat up. He'd never be able to sleep now. He pulled out the map. "I solemnly swear that I am up to no good," he swore and tapped it with his wand. His eyes flicked across its surface, taking in the names and locations. Professor Snape was in the dungeons with…Professor Lupin? He peered closer. Yep, his favourite professor was with his least favourite. They could be patrolling, but it looked like they were in one place. Was that in Snape's office?
He bit his lips, then got up. He pushed his feet into his battered trainers, made sure he had his wand and slipped from the room. He made his way down to the Dungeons, checking the map periodically. Yep, they were still there.
He made his way to Snape's office, double checking his own progress to ensure he was in the right place. He heard a soft sound. What…? A moan, why would he be hearing a moan? Surely they weren't fighting?
He cautiously approached the door and leant closer until his ear was near the surface. Definitely moans. His eyes flicked over the door, glad this was one with a keyhole, and crouched until his eye was level with it. He peered inside, willing the darkness to lift enough that he could make out what was going on.
They were…there! By the desk. He leant forward slightly, so he was as close as he could be. Professor Lupin was leaning over the desk. Yes, but he was rocking back and forth. He ignored another moan as he strained his eyes to make out where Snape was. He had to be there somewhere.
Oh! He was- He blushed furiously as he backed away from the door as quickly as he could without making noise.
He couldn't believe it! Professor Lupin, by far the most interesting professor he had ever been taught by, was having sex with the git that was Severus Snape! He had a hard time wrapping his head around it, and he'd seen it! Though he wished he hadn't, it was going to haunt him for a while.
He knew that men had sex together, but he'd been taught it had been wrong. Then again, he'd heard this from the Dursleys, who thought he was a freak for having magic. Maybe they were wrong?