You demand proof.

“Ok nice story, but how do I know it is true and you aren’t just trying to **** me with that vial.”

She smiles and hands it to you. “Here hold this.” She then lifts her skirt and pulls aside her panties and her 10” cock, easily 2” thick plops out of her panties, hanging down by her supple soft legs. You look at it in awe realizing she isn’t even hard and it is still bigger than yours.

“Holy shit, is that real?”

“Touch it, tell me what you think.”

You reach out and descend to your knees to get a closer look. As you take the massive cock in your hands the warmth tells you it is real. It is softer than you would have thought. “I can’t believe it, this thing is massive. You say the potion did this.”

“Yeah it apparently looks into your mind and makes you what ever it thinks would make you happy. For me that apparently was a cute Japanese girl with a massive cock. I figured it was because the only real porn I watched was Japanese anime porn, where all the hot little girls get fucked by monsters, or meet hermaphrodites, or just dyke it out together and fuck with monster strapons bigger than any real cock. Go ahead and drink it, if you are supposed to be a man it won’t do anything but maybe make your cock grow, and if you aren’t then you will love your new self like I do. Or just suck my cock and I will fuck the hell out of you if that is what you want. But I must admit I think when I handed you the vial and you took it that once you hand it back even if you don’t drink I think you will get a phone call telling you the rules and you will have to be careful who you tell our secret.”