Ambysta Maris's Sexual Training Gym!

Beaudoin approached Ambysta's training room to answer the call of his weekly challenge. But he wasn't wearing the smug smile he usually wore during matches against weaker opponents. No, this was a test that would directly target his weak point: his prostate.

He stopped in the middle of the training mat where the vibrator was located. The toy was quite small and harmless; he had no idea what this vibrator had in store for him. He took hold of it firmly and began to move it towards his buttocks before rubbing it against his tight anus. With his other hand, he applied the lubricant that was nearby to facilitate penetration, and with a push, he forced his anal walls open so the toy could enter him, letting out a timid moan despite his attempts to suppress it.

Beaudoin activated the toy. It began to vibrate inside him, in all directions, but his prostate wasn't affected initially, so he kept his back straight, managing to get used to the gentle stimulation of the vibrator for the first five minutes.

The fifth minute passed, and he felt the vibrator inside him suddenly grow and change its vibration pattern, becoming faster and more intense. Beaudoin's prostate began to feel the repeated shocks from the toy, to the point where he started to bend his knees and lean forward. Sweat began to appear on his forehead, but he held on, it wasn't intense enough for him to lose his balance.

The tenth minute passed, and he hadn't noticed the time. The vibrator grew larger, the intensity and speed increased, and the rotating motion became circular, massaging his prostate, which cried out in pleasure. Beaudoin finally collapsed to the floor on his back, panting heavily, sweat covering his entire body. His penis swelled and throbbed wildly, precum running down its length. His nipples hardened with arousal, and he slowly rubbed one of them with his hand. He could no longer control his desire as the third stage of orgasm began.

At the 15-minute mark, the vibrator had reached an impressive size, its imposing width extending all the way to his tailbone. The intensity of the vibration was too much for him, the speed unbearable, but the worst part was that the rotation was now directed against his already abused prostate. It was too much for his body. At 16 minutes and 34 seconds, his voice suddenly rose to a high pitch. He pinched his nipple as hard as he could and closed his eyes. His hips jerked upward, and his hard penis released a stream of white semen that sprayed both his lower abdomen and his legs.

Completely on the floor, exhausted and utterly abused, the vibrator slipped out between his buttocks without any problem, thanks to the dilation of his anal walls. He still manages to draw a vicious smile on his face while panting because he was proud of having lasted so long, but the prostate will always remain his weak point.

Well, lets do something easy and see if we can get the ball rolling. How long can your character last under a vibrator? And to make it harder, have a random size/speed/different stimulation swap every 5 minutes