Extrait :
1. Fantasy is the articulation, in whatever medium, textual or audiovisual -- in the medium of imaginative thought if nothing else -- of a series of events having an epistemic modality of "did not happen" but treated as having an epistemic modality of "did happen." Which is to say, when we're talking of sexual fantasies or revenge fantasies, of a paranoid fantasy or a fantasy of fame and fortune, we're talking simply of suspension-of-disbelief in imaginary events. Don't give me any bullshit about this missing the point of the question, by the way, about that not being the type of fantasy we're talking about. We haven't established the type of fantasy we're talking about. And I doubt we will be able to. We can add a little nuance here though:
1.1. While this openly-defined fantasy (meaning 1) does not necessarily also have a boulomaic modality of "should happen," in which the series of events articulates desire, (paranoid fantasies being an obvious exception,) it is strongly associated with such, (with even paranoid fantasies essentially positing the supreme importance of the fantasist.) If desireability is not denoted in fantasy (meaning 1), it is certainly a connotation.
1.2. While this openly-defined fantasy (meaning 1) does not necessarily also have an alethic modality of "could not happen," in which the series of events is logically, physically, historically or technically impossible, it is strongly associated with such and with the related alethic modality of "would not happen," in which the series of events breaches expectations of consequence. The more implausible the series of events, the more "fantastic" the fantasy (meaning 1).