[Spoiler]
To get the final ending you drink the tea after having finished both of the other endings!
*SPOILERS BELOW*
Ah, yes, I know that! I was just wondering what happens next if you choose that option without having completed both endings. Because, I mean, Amy fails in getting any real info out of the tea (😂) and then what? Do you just get a game over? Are you presented with the choice of who to investigate again (perhaps with only the remaining two options to choose from)? Or is there something like a text: "You can't proceed futher"? 😂 I'm also curious whether it has any sort of narrative justification! Like does Amy decide investigating the guests is hopeless and decide to investigate something else (and then the player is moved to the choice of who to investigate again) or does she just give up/fail (and then the player gets a game over)? I mean, I'm a completionist, I'm interested in almost every little detail 😂 I even tried to search for the file(s) with the code of the game 🤣 On my own computer of course (didn't try that hard tough) 😅