He becomes a organ of one of his teachers

Jon had a peculiar thought: it would be fascinating to become an organ inside someone's body. He voiced his wish aloud, saying, "I wish I were an organ inside one of my female or male teachers, and that they would always easily agree to it. I would be an organ inside them for 24 hours, after which I would be teleported back to my house and transformed back to normal." As he spoke, the stone in his hand glowed, and Jon suddenly blacked out. When he regained consciousness, he found himself unable to see anything. "Where am I?" Jon wondered, as he recalled his wish. The question remained: whose body was he inside, and what organ had he become?