Before Ms. Wells could ask for the next volunteer, you wonder aloud "In fact, it feels nicer than I ever expected. I kinda expected I'd feel some kind of loss from not having a penis anymore, but instead I feel like I've gained something from having breasts and a vagina now, if that makes sense…" a bit unsure of yourself toward the end. After a pause, you had "Can you make the change permanent instead, please?"
Everyone in class start whispering, afraid of what it could mean for the rest of the experiment, while Ms. Wells look at you with a worried face. "Oh dear, did I accidentally change your mind too? I would have sworn I didn't touch your brain…"
"I don't think you did anything to my brain, Ms. Wells" you try to reassure her, "I think that's something that always was in me, I just didn't know it before today. Thank you, by the way."
Alas, you can see with how she's looking at you that she's wholly unconvinced.