If you’re really desperate for Potion Maker NTR the only content in the game I know of is with goblins. She can be grappled and fucked by them but it’s only one missionary standing pic.
In the old version of the game you could glitch into a second scene. IIRC you either had to down Kohaku, let the goblin start the scene, and then down PM before he finishes or just have them both down at the same time and have the goblin attack Kohaku first. This would give you her standard 0HP cg (doggystyle) but with the goblin fucking both of them.
From my short time on the new versions I haven’t been able to recreate the glitch for the second scene. I also don’t believe Potion Maker has any scenes with any other enemies but I’ve only tested this on the pirates and goblins.