Jon figured out that the simplest thing to do would be to make someone pregnant. A person.
On the other hand, Jon didn't think most people would be very happy if asked if they want to have Jon's baby. It's a very strange request, and even if someone believed it, who would want to do it? At least you don't have to worry about whether inanimate objects would let you do it. Jon considered using one of the silly inanimate objects in his room anyway, thus creating a child who was half dirty sock, but then decided to use the stone. That's what it was for anyway, right?
"I wish that someone who'll want me to make them pregnant using this ring would come here and I'll be able to do it."
The doorbell immediately rang and Jon hurried downstairs to answer it. He opened the door and the person there was dressed as a woman and looked a bit feminine, but not quite. She spoke in a voice that sounded too low, although she seemed to be trying to hide it.
"Welcome," said Jon's mother. "You must be Tracy?"
"Yes," said the person.
"You're a transsexual?" asked Jon's father.
"Yes... of course I can't have children like someone born a woman. But I traced a ring with magical powers sold at a yard sale, to your son. It's magical. I could have a child of my own that way."
"We decided," said Jon's mother. "It should be acceptable. But Jon's just a teenager. I understand this doesn't involve sex, right?"
Jon said "Right, Mom."
"Then there's no question of Jon being underage." Jon supposed that any complaints she might have that couldn't be explained away were handled by the wish. "How does it work, Jon?"
"Oh, it's simple," replied Jon. "I just touch my... I mean I was, er... playing with myself, and on my hand I still have some...."
"I don't want to hear the details," said Jon's mother.
"But you said you wanted to...."
"Don't get smart with me. I don't want to know the details of what you did in your room, but I need to know the details of this procedure."
Jon reached for Tracy's shirt, lifted it up a bit, and touched the semen on his hand to the stomach, mentally ordering the ring to do its work. Then he pulled his hand back and said "That's all. Tell me tomorrow morning how it went." He grinned and returned to his room.