As Trent drove home another thought came into his mind, "Would it be possible to merge into the motorcycle?" Although it seemed natural for him to have such an idea now, he didn't remember his own side being fond of motorcycles at all. "This must be my Shawn side", he thought. His purring and rumbling motorcycle seemed to invite him, but he didn't want to risk merging into it while driving. Suppressing his urge only made him more aroused, and his own weight pressing him onto the motorcycle seat certainly didn't help. After a few minutes, that seemed to him like hours, he reached Shawn's home. Quickly he opened the garage and pushed in the motorcycle. The garage, which was clearly only used for motorcycles, faced sideways from the road so no passer by could look into it.
There it was, the object of his desire. Shawn's motorcycle, now his, was a souped up superbike. The bike itself was black and shiny, on the front and the tank, it had green decorations nearly glowing in the dim light of the garage. The stand was down, so it would stand on its own, lifting up the hind wheel a bit. The urge becomes unbearable, so Trent mounts it and presses his legs against it as hard as he could and gave the mental command to the ring.
Just before he was starting to ejaculate, the changes happened. At first his whole lower body started to soften into a blob. Then this blob seeped into the leather, at the same time, parts of the motorcycle softened as well. For him, this was a feeling of orgasm, but instead of shooting cum out of his penis, which was gone by now, he shot himself into something new, something alien. He slowly felt the engine, his engine, powerful and under his command, being a part of him. Gradually he became beware of his new parts, the lights, the fuel tank, the brakes, the wheels, everything became part of himself. He started to feel every part of his motorcycle, how full the tank was, what temperature his engine was. As the ring completed its work, what was left was a strange kind of centaur. Instead of a horse it had a motorcycle, and unlike with a normal centaur, the human part was sprouting from the seat with the cockpit and handlebars still intact. His leather outfit seemed to blend seamlessly into the motorcycle seat. As he started up his engine to rev it up, he moaned as a surge of power flowed through his body. He pulled up the stand, which was what he now had instead of legs, and shivered as he felt his hind wheel hitting the ground and rubbing on it before finally getting some grip. Empowered by his new feeling he races through the streets at night.