Lanefan
Victoria Rules
My character wearing a red cloak, as opposed to a green one or a white one or no cloak at all, isn't very likely in and of itself to have significant impact on the subsequent fiction. Saying yes thus has no real future impact or consequences - there's no stakes involved."Saying 'yes'" isn't GM force. It's not GM force when a player in an AD&D game says My character wears a red cloak and the GM says OK.
The belief/non-belief of the lie in the example clearly will have great impact on what happens next and, probably, ongoing impact for some time after that. Here there's stakes involved, thus the GM simply saying yes to one outcome while denying the other (or any others) is a use of force.