There was a recent RPG Maker game that got released on DLsite.
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Haven't played it yet as it remains untranslated but it does have a lesbian/futa NTR path for players to follow.
Hoping for a translation in the future.
**EDIT:**
Okay, so I used textractor to play it. Kinda messy but understandable enough to get a gist of what's going on.
You are an adventurer and your ship wrecks due to a kraken attack. While stranded, you meet up with a healer girl named Meryl. You two decide to stick together and forage for supplies to survive, growing closer as your chances of survival go up.
That's just the prologue. The real meat of the game starts when you start meeting fellow survivors. These are the ones who will cuck our MC. The scenes will eventually appear in Meryl's diary, which can be found at base camp with a flashing heart symbol above it.
Out of the 6 findable characters, only one is a woman/futa who has her eyes our for Meryl. Her name is Karina.
How this game allows those routes to progress is incredibly simple. Whenever you explore certain regions of the island, it drains your stamina/energy meter. When the MC is alone and this meter his zero, the game prompts the player to choose WHO Meryl might be thinking about. If the player chooses Karina, they will get a scene that shows Karina corrupting Meryl while they're gone. Do this a total of five times and Meryl will run away with Karina, ditching the MC.
I am going to explaining the scenes next and giving my thoughts/review, so if you DONT want to know, STOP HERE.
As for the scenes themselves, the first scene is the best, with the most varied CGs. Meryl does her best to push Karina away, trying to maintain that she's "normal" and has her sights set on MC, while Karina is making out with her and grinding her thigh against her crotch. She climaxes anyway. The second scene goes similarly, though Karina targets Meryl's nipples instead. Meryl successfully pushed Karina away once again.
The third scene is where I feel like this kinda goes downhill. The game was setting up something good by slowly corrupting Meryl over to the other side, and I personally like the lesbification process the most in these NTR stories. However, Karina is a futa witch and casts a seduction spell on Meryl, taking all the drama and steam out of the whole ordeal. Meryl falls apart pretty quickly and becomes Karina's toy faster than you can say "NTR." Not to mention, the next three scenes end up reusing the same several poses in them, which sucks if you were looking for more variety like I was. Meryl is always on the receiving end and doesn't really reciprocate to Karina, who is a looker herself and a shame we don't get to see more of her body alongside Meryl's.
One perk of this game is how much you customize Meryl for these scenes. You can give her nice suntan and/or put her in a variety of outfits to give those previously mentioned scenes new window dressing. It's minor but it's still a neat touch.
All in all, it was a decent lesbian ntr experience that started off strong but rushed too quickly to the finish line. If you like that sort of thing, then this might be nice slice of Lesbian NTR you were looking for, given how rare this kink is.
It gets a strong 7 to 8 from me
also, the developer of this game has another lesbian NTR route in another game:
Countdown to NTR
It's been translated and also has a walkthrough if you're willing to give it a shot.
Given that this dev is giving our much starved kink some attention, I suggest keeping an eye out for whatever he does in the future. I know I will.