Harry and Ron

Harry and Ron sneaked up the stairs to the Gryffindor girls' dormitory. Most other Gryffindors had gone to watch the Slytherin-Hufflepuff quidditch game, meaning the common room was completely empty. Besides, Harry had the Marauder's Map to keep an eye on where everyone was, so they were pretty confident that they wouldn't get caught.

Once up the stairs, they made a beeline for the nearest beds. Kneeling in front of one, Harry tapped the trunk sitting in front of the four poster and whispered "Alohomora". The trunk sprung open, revealing robes, skirts, blouses, all neatly laid out and folded. Rummaging through, Harry found what he was looking for - the pairs of panties that lined the bottom of the trunk. He felt himself start to harden as he pulled out pair after pair. "Ron, check it out! I found some!", he called over to his friend who was investigating a similar trunk in front of the opposite bed.

Ron crawled over as Harry held up a particularly lacy white thong, that didn't look like it covered much skin at all. "Whoa..." gasped Ron, feeling a bulge in his own pants. Reaching over into the trunk, he pulled out another pair - tiny red boyshorts, that looked to have been freshly worn. Ron held them up to his nose and inhaled deeply. "Awesome...'"he breathed. Harry grabbed another pair with one hand, a grey designer slip, and started to rub his crotch with the other. "Whose trunk is this, anyway?"

Pulling the lid back down, they saw that the metal plate was engraved with the name 'Hermione Granger'. "Shit!" gasped Ron. I had no idea she had such slutty underwear... Trying to be surreptitious, he started to pull his now rock-hard dick out of his trousers and rub the red boyshorts up and down its length. Noticing what Ron was doing out of the corner of his eye, Harry pulled down his own cock out and started stroking. Accidental glances in the prefect's bathroom meant that he had always suspected he was somewhat bigger than Ron, and this now confirmed it - Harry was considerably bigger that Ron's 6 inches. Sniffing the slip while he stroked with the thong, he started to groan quietly, the musky scent intoxicating him.

The Marauder's Map lay forgotten on the floor by the stairs as the boys pleasured themselves over Hermione's dirty underwear. Had they seen it, they might have had a bit more notice when they heard footsteps on the stairs up to the dormitory...

"Fuck, Ron! Someone's coming!" Harry whispered with alarm. Ron made a startled face, snapping him out of his ecstasy. Shutting the trunk lid as quickly and quietly as they could, Harry and Ron dived under the bed, covering themselves as best they could with the Invisibility Cloak. They had just managed to conceal themselves half-decently when someone entered the dormitory.