Jake looked at the sliders. He thought hard. 7 inches hard? No too small... 8? no... Jake didn't know what he wanted.
Suddenly the app beeped again - "Having trouble choosing a size? Enter continuous growth mode. Press stop when you wish to stop. Change is final once you stop". Jake couldn't believe his luck. Enabling the mode, he set the growth to slowly occur, and pressed Start eagerly.
Immediately, the front of Jake's briefs began to slowly fill back out. Jake watched eagerly as his briefs began to fill up again, his cock growing longer and expanding in width proportionally. Soon Jake's cock was back to its normal size, but Jake didn't stop there. It kept growing.
As Jake's genitals kept expanding, his briefs began to fill close to their maximum. The white fabric began to stretch to cover Jake's increasingly large cock. Jake's fantasies were coming true... then he snapped out of it. As much as he loved having a large cock, it did need to be manageable. Seemingly waking up, Jake pressed the stop button. The app beeped "Demo locked - have a nice day".
Breathing hard, Jake stared down at the sizeable bulge in his briefs. Slowly pulling them off, he marvelled. His balls hung low and looked to be almost the size of tennis balls, while his cock seemed to be almost 8 inches long soft. A little smaller than his size at the store, but not much. Jake was thrilled. He could live with this!