Oh, but I do believe I discovered that which you are referring to in another playthrough :)
Very good work so far. Looking forward to future content. Keep up the good work!
At the beginning of the game when you "study" you come across a girl who turned herself into a purple goblin thing and a dwarf lady trying to help her. you have to go through the options where you check logs and end up asking Penny about it. Penny turns the girl back into a human. I think her name is Belle or something. After that, she's the one you give the potion to. Fair Warning, the scene is "one-and-done" as far as I can tell. Enjoy!