How can I give a used serum to the other character?
And sometimes it happens that the characters no longer speak in the normal way and I have to use the "pass time" option to see an interaction with the character.
At the moment you can’t mostly because I don’t have events associated with multiple uses. Try again in another build once I have more stuff written out.
Dialogue changes as you continue further into the game, there’s a small cooldown between talk events