Somehow Jeff is transported to a bathhouse.
The first guy he goes into is a big buff guy. He has been handballed over and over so his ass is extremely stretched and Jeff expands to fill it and the moans begin to stimulate Jeff. Soon Jeff is shooting into the big guy.
As he pulls out he teleports to the next guy.
As he hops from guy to guy over the next years he realizes this is much more exciting than fucking women.
He is really enjoying this and he finally realized that the men that had been altered by entering them had been straight men. He never thought about the possibility of jumping into a gay man's ass. And this altered his transformation into a dildo. And it also altered his desire. He found that he could now adjust who he jumped in and if there was a choice between a man and a woman he now preferred men.