Jeff, who was inside Dave's inner-space cockpit fiddled with some controls which caused Dave to undo his pants. "Hey", the badger exclaimed as he was unable to stop it. Steve grinned and bent over to get on his hands and knees as Dave's member started to peak out of of his sheath. Dave was forced to get to Steve's bum who teasingly swished his bushy tail. There he pushed his member into Steve's bum-pipe.
At first Steve's ball sack started to expand. It didn't get much wider, but longer as it became a wheel that quickly touched the ground. It started to turn dark around its border and gained a smooth surface with tire tracks in it. Eventually it supported his weight and Steve rested his weigh on it. Then an axle formed and he put his feet onto it. Quickly they became rectangular and formed the suspension of the hind wheel, which was starting to look more and more like a motorcycle wheel. His member was clearly erect now and at a thrust by Dave's dick inside his tail-pipe, it started to splurt out an oily metal chain which found its way towards the hind wheel and connected to its gear before returning somewhere unseen. Meanwhile his tail-pipe got a bit wider, as well as his backside. On it's sides a pair of saddle bags formed. His tail got longer and thinner turning into a radio antenna. The top of his bum and back turned into a padded black leather seat, surrounded by red metal. His belly had grown quite a bit, extending downwards and connecting to his former legs. Gradually the fur and flesh receded leaving behind a powerful engine. Jeff noticed that Dave was about to cum, and promptly shut of his member causing him to be frozen in bliss with no way to relieve himself.
Steve paused the transformation somewhere in the middle. While everything behind his chest closely resembled a motorcycle, his head, shoulders and arms were still as before. He used his hands to move himself a bit away from Dave and then turn around. "Thought you'd wand to get a closer look", he said as he approached Dave who was frozen in his orgasm, desperately hoping to release. Then Steve got closer, real close to Dave's errected member and started to lick it. This sent shivers through Dave's body, and Jeff released control of Dave's body again. Promptly he began to shoot his hot semen into Steve's mouth. Steve's hands ballooned in size and became black, then at the next thrust his arms turned into the front wheel suspensions. Another shot and his ears changed into mirrors, and another changed the back of his head into the instrument cluster. Then after the final thrust his face changed into the front of a motorcycle. His eyes turned into headlights, as his mouth seized up, pushing out Dave's cleanly licked member. As Dave calmed down, what was in front of him was indistinguishable from a normal, though customized motorcycle.
After cooling down Dave closed his pants again, and stated, "Wow, I didn't think I'd like that as much as I did."