I’d put the practical distinction in the option text, before the player commits, and use Mara’s response for its emotional consequence. For example, if both routes intentionally give the lamp, “Ask for the lamp and a signed account of what happened” would make that clear without revealing the ending. Her response can then show what being pressed for a written admission costs her. I’d avoid promising a different lamp outcome if the real distinction is accountability and trust. That suggestion comes from the one route I tested, not a comparison of every branch.