In my Sixth Year, everyone assumed I was obsessed with Draco Malfoy, but as the saying goes, assume makes an ass out of u and me. Really, I was obsessed with Marcus Flint.
It all started after a Slytherin/Gryffindor match.
The Slytherins showers were broken, so they had to share with Gryffindor. Harry was secretly pleased, because that meant he might sneak a peek at Draco Malfoy, who he had been crushing on. Instead, Harry saw the burly Slytherin captain, Marcus Flint, completely naked.
Flint was soaped up, and half-hard. Everyone is half-hard after riding on a broom. Then, Flint grabs his cock, and starts rubbing. His breathing gets shallow, and then deeper.
He climaxed, and whispered, "Harry."
Harry stepped out of the shadows, and whispered, "Want some help?"
Marcus gasped and whipped his head around, wiping his hand on his thigh as he did.
"Why would I need your help, Potter," he snarled, but his voice was quiet and hoarse.
"Well, I guess you don't. But I could sure use your help," Harry said, gesturing to his erect dick.
"Well, get over here then," Marcus said.