Hmm, I think you are right, that generating your own fantasies is different than enjoying/going along with something someone else has structured and shared, though generating your own fantasies has a lot in common with the creation process.

So one would possibly say: fantasize about for the sex with oneself
Fantasize about (generating one's own fantasies) a pairing
Enjoy/get turned on by fic about a pairing
(Perhaps even revisit (rehash in one's own memory or re-read) a fic for personal pleasure (no need to get too detailed, either mental pleasure or "I'll be in my bunk"))
Transcribe personal fantasies about a pairing to fic
Generate fic that is then pleasurable to read
Generate fic for the pleasure of others, but that one is personally not pleased/turned on by