Just reached one of the endings, fantastic work! The writing has been thoroughly enjoyable, the kink stuff copious and the puzzles have been quite fun.
However, I don't seem to be able to find a way to move Meloni or Helga without using up the wish. The bra doesn't seem to be an option, with Sara just dismissing it. Is there a playthrough anywhere?
I do wish you were able to make a hard save file on your computer, though. The game is pretty long, and I don't think the three soft save files in the game (which are nice) will persist between incognito windows.
Viewing post in Enter the Expansion Mansion comments
I'm by no means an expert on Twine or HTML, but, within Harlowe (the Twine coding language I'm using), the save options are limited to the browser cache. It's entirely possible that other games are able to do a hard save using Sugarcube or some other Twine language. I don't know enough about those languages to confirm or refute, though.