>>2885783I think one of the biggest mistakes I see people making when it comes to long-term ENF stories is that they fail to make it an interesting story divorced from the ENF scenes. It's not as though the nudity shouldn't be the primary appeal, but it's nice to have some sort of ongoing plot in between the different 'climaxes' the story has - like how the best ecchi games are the ones with decent enough gameplay that you keep playing even after post-nut clarity.
Basically, when you write an ENF story that's more than a single chapter long, it helps to have an ending in mind before writing any more so you don't fall into the all-too-common trap of the story meandering around and feeling pointless.
So if a girl has to spend a long time naked as punishment for a crime she didn't commit, then when you outline the story it should primarily be focused on having her solve the mystery and gather 'proof' of the real culprit - and then pepper in the lewd scenes wherever it feels most natural.
If she's being blackmailed into going along with some sort of exhibitionism, then each scene should introduce a potential suspect or reveal some new evidence of who it is that's blackmailing her as well as working towards the end.
If she's being punished for something, how long has that punishment been in place and how effective is it really? If it's not effective, then who is pushing for it and what's their actual end goal? And then how does the heroine figure all of this out without the author throwing in a ton of long-winded exposition that readers are going to skip through?
tl;dr
A good ENF story has to be a good story, too.
