Yes, only to find some limitations on these powers.

John/Wendy stripped as he admired this new form. His chest had the same color as rest of his body, so it appeared that there was at least some consistency to all this. John touched his chest. Even though he knew Wendy was flat, there didn't appear to have been any development at all.
A quick disrobe of pants and undergarments confirmed this suspicion. John's cock was still there in all of its morning glory.

The thought of this being impossible came to him. Maybe he wasn't even able to change his sex after all. Even so this power was pretty sweet anyway.

John walked around most of the day in this new form. He found that he didn't even need to concentrate on maintaining this shift and even when he relaxed he found himself in a lot of comfort. As the night started to close in John had learned to manipulate individual parts of his body to suit his needs and he had grown curious.

John sat on his bed and closed his eyes. Focusing on his chest. Imagining himself with big lovable squeezable orbs. Even before John had opened his eyes he knew that it had worked. He could feel how his chest had gotten heavier and more sensitive.

This was an interesting development. It seemed like John could manipulate his body as he wished, though could not replicate something specific unless he had seen it.

The only question remained. Was he able to change his sex? John focused on his cock. Imagining in its place and snugly little slit. Dripping with anticipation and excitement. Tight and ready to be fuced like those he had seen on the web.

John opened his eyes and looked at the mirror.