A/N: No characters are mentioned here, I just want to leave it to your imagination, though I did have a particular (non-canon) couple in mind when I wrote it.
Secret lust, hidden in the confines of the Gryffindor tower. Still they go undetected, hidden between the sheets. Fierce kissing, roaming hands, heavy breathing… The sweat only adding to the sensation as their bodies rub together. They know what they are doing is wrong, but the excitement cancels out all emotions other than the desperate desire to caress every inch of skin the other has.
When their eyes meet in the corridor, a flash of a grin is exchanged, but they walk on pretending nothing had happened - a slight skip in their step as they anticipate what they know is to come in the evening.