Not in the immediate future, we gotta implement the rest of the lewd scenes we've got in the pipeline, then cycle thru the female companion characters and their content (which is strictly MC + Love Interests). We do wanna get to it in the future tho, it's on our to-do list... along with a bunch of other fetishes.
Would probably be done with female NPCs that aren't strict love interests. Captured enemy commanders like female orcs and bandit queens, that you can hate-fuck and then whore out for gold. Basically characters you have no emotional attachment to, and have an in-game reason to despise (since they'd tried to kill your party before being defeated and captured, lol). The core LIs like Meredith aren't gonna be shared, because as you say even having them do stuff like gloryholes would be NTR-lite, which isn't something we wanna do. We advertised the game as a harem/chad experience from the start, so it wouldn't be fair to do a 180 now and start NTR-ing the core cast of characters.
Yup, we don't wanna force any kinks on players. That's why there's always a "YES/NO" prompt before lewd content.
Unrelated to all that: the game's gonna release on Steam at the end of summer, we've got a ton of work to do... gotta get some more 18+ content in there, and a few more maps. I've finished the writing for the next 4 maps (currently working on the 5th one), we just need art & scripting, which should hopefully be done in time for release. Once we launch in Steam EA we'll do a mechanical pass for inventory & combat. Until then, the game's gonna play like a sandbox VN, we gotta get thru the story & lewd content first before tackling mechanics. Card-combat art is gonna be a bitch tho, there's a ton of it to paint.
People keep asking for this...

I'll ask our scripter to add a cheat menu, with auto-unlock for all scenes.