Plenty is a bold statement for what looks like maybe 10-15 events in a recollection gallery of over 100. So maybe 10% of the scenes aren't NTR? Maybe you can pump that up a little further if you count scenes that don't involve either Mist or Elycia?
Here's a thought: make NTR the penalty in the game for losing, not the only sex in the game. It's for being pathetic. It was your own lack of skill/effort/grind/awareness that caused you to get cucked. MC had every opportunity to enjoy plenty of sex with his girl but because you failed, all MC saw was his girl being fucked by other guys.
This is less about demanding NTR games have pure love sex scenes and more about criticizing bad game design that punishes the player for not losing or not making decisions to intentionally cuck themselves. Either railroad the NTR since that's what you're assuming people are there for, or make it so there's actual in game rewards beyond "well, you saved your 2D gf. Congrats. We'll consider giving a complimentary, low effort sex scene or 3." This would naturally be a lot more work to create, but it would make a genuinely "NTR Avoidable" NTR game. Unless pure-NTR fans would be offended by the prospect of being able to both save the girl AND be rewarded with at least half as many unique sex scenes as there are NTR related scenes. In which case, pot, the kettle called....
Now, if there was a dev that played into this and made some fourth wall breaks where they make it clear they're actually cucking the player and not MC by denying them sex scenes for helping MC reach Pure Love/Happy end, then sure. Lean into it. But otherwise it's not "NTR Avoidable" it's largely just "Sex Avoidable", which makes for a really bad h-game design decision, even if NTR is the focus.
