Had a couple scene ideas I figured I'd post. Both have a mystery box vote open so while its a long shot I figure there's a small chance they may see it and have a similar idea. I posted these in the Patreon community but it has no real interaction so I'm copying them to here.
After seeing the condom eater art I had an idea I had to type out. What if Lura could ejaculate as long as she knew someone would for sure swallow it? Have a contract you get paid for by the brothel madam and have a Skyrim style courier (I have something to deliver, your mouth only) chase you down with condoms filled to the brim and most likely a note from Lura he reads as you do your job. The longer you avoid him the more he has to deliver prompting different scenes and potentially enough to cause a game over through sheer amount. (Refusing to swallow would also probably have you captured and taken to the mouth maniac ending set for breaking contract) I figure have him be a map moving NPC that always follows the player but only moves every other player movement so he's decently avoidable which makes it possible to get scene variations easier.
One more idea, the sperm bank and guess the taste game. You can play a game where you pay for a milkshake and have to guess the "flavor." If you haven't figured out what they are, the flavors are masked behind euphemisms about who they came from and you have to guess based on clues between thickness of the milkshake to muskiness and how much chewing you have to do. If you know what they are you get the same game but with much more degrading from the nurse and no hiding that your taking glasses of cum and trying to guess who your drinking. Maybe have a chance of the donator also watching behind something and rewarding you with a fresh drink straight from the tap if your right! (Good luck with the reward if Lupa donated.) If you win you get a refund!