You decide upon the red potion. It is as good a choice as any because nothing whatsoever is there to give you one sort of a clue as to what each phial holds. Only the colors are different. The phials are identical. The choice itself is not great, you ponder. The world of the sorcerer is one of fantasy and of mythology. You could become a dragon, a centaur, a fairy, an elf, a spirit, a unicorn or any sort of creature. You'd be free but... You would have to get used to a new body. And... What if your sex changes? You're not okay with that! You like your gender and don't want to switch at all! You like being a guy! You want to keep your privates! What will you do in the body of a girl? The mere idea of possessing a vagina instead of a penis is enough to disgust you to the point of wanting to throw up. Ugh! Disgusting! Sick! And then getting a menstrual cycle every month and getting pregnant... That would be the worst! The sole thought makes you want to hurl. For nothing in the world would you become a girl! Yet the other option isn't that great. If you change into something of your human world, then you are a slave for an evil sorcerer. He could then change you into a fantasy creature, one of his world, and do with you as you please. And he said "something". That's very ominous and not good at all! You could become someone of the other gender and of a different age. The first option of turning into a fantasy creature is the less worse outcome but just as hazardous. But you don't have a choice. You are scared to the very core of your being, with reason, but you decide upon the phial containing the red potion. You pray not to become female and to change into a cool fantasy creature, like a dragon. Maybe, just maybe, this could work out in your favor. There's a slight chance of that. You also swear that if you get out of this situation, you'll reform your ways, be a good boy, stop being a bully and never, never, never, ever cover the house of anyone in toilet paper. With trembling hands, you pick the red potion, uncork the phial and drown it in three little gulps. The awful grin and evil glint in the sorcerer's eyes hold no indication as to what you've swallowed exactly. That moron would be happy whatever the outcome of your choice, certainly. And then the transformation engulfs you and you wish you had a mirror to see what you've just drunk and with what consequences. Suddenly, the world started to become much, much bigger. Shrinking! You were shrinking! But into what?!?! When the phenomenon stopped, the wizard, now a giant, grinned with a happy yet mischievous smile and bent down. He tickled you under the chin, resulting in involuntary giggles. Since when had you become so tickled?
"What an an adorable baby," he said. "An adorable human baby."
You were not only his for all eternity, but you were also back in diapers...