A rather shy girl named Mia walks over to the fountain. She is in your History class and is sensitive over her flat chest. Mia takes a drink from the water and walks away. You trail her to see the fruits of your potion.
Mia walks into the Men's bathroom, so they clearly noticed the change. Mia walks over to the urinal and takes off her skirt, only to jump in surprise. You walk to the urinal next to Mia and look to see no sign of a dick, and Mia was as shocked as you. Was Mia a guy the whole time and you just didn't notice!?