My mom is a man..?

"I wish," said Jon, "that, until I wish otherwise...my mom becomes a guy!"
The stone glowed, and Jon knew that his wish is granted.
Jon heard his mother go into the kitchen to make dinner and went out to see how things had changed.
He saw a young guy, definitely well built and wearing one of his mom's outfits.
She - or better, HE - was wearing a miniskirt and a sleeveless shirt, and Jon could see him only from his back. And he saw that his 'new' mom had a very hairy back, thick and hairy arms and legs, but her hair was still unchanged.