Starts jerking off right there

Sam waited and waited, but none of the shower stalls opened. After a few minutes, he couldn't help himself anymore. He pulled down his pants, and started pumping his dick with his hand.

It felt like an eternity since he jacked off. In fact, been less than four days: That may not seem like a lot to most people, but, to him, it may as well have been years. He luxuriated in the feeling of rubbing his hard cock up and down. Controlling the tempo, controlling exactly what spots got the most attention. He leaned back against the wall, thrust his pelvis slight out and got just about as relaxed as one can standing in a tile bathroom.

He alternated between straight strokes, up and down, with a twisting motion. He tended to linger around the base of his cockhead, twisting all the way around before going back down. Up and down, up and down, each movement sent a rush of pleasure through him.

After the initial, almost nostalgic joy of it wore off, he noticed a couple of things were going... differently.

First, this was going for a long time. With women, he tried to hold out as long as possible, but when jacking off Sam trended toward efficiency. Generally speaking, he could make himself cum in a couple of minutes; less if he was already horny. Those few minutes came and went, and he was still standing there. He was still throbbing hard and did not feel close to cumming.

Second, it seemed crazy but he thought his dick might have gotten bigger? Something felt off about how long it took for him to get from the base of his trunk to the tip. It took awhile. His cock also felt heavier in his hand. Nothing crazy, but when he held himself at his base, he could feel the weight of his dick in his hand. The "changes," assuming they weren't just his imagination, were slight, but even a minuscule alternation feels like a tectonic shift when its on your most intimate, important muscle.

He continued stroking. He sped up. He slowed down. He twisted, he pulled, he rubbed one finger all the way down the underside of his cock, which he loved to do. He kept stroking and stroking and stroking.