I have a little wishful hope that the "lewd" mystery party member might be that black and purple machine girl from the "pre-mana milking" scenario where MC is rescued from stasis chamber. It's a big ask, but if that busty, voluptuous mana-milking succubus-looking machine unfortunately isn't a party member, I hope we get to encounter her type again, maybe even a friendly one that won't use MC for the machine-hivemind purposes? :D
Pretty please? :D