Honestly..... I don't think there is anything to update in this game. What storylines are unresolved? Amina? Lucy? I think they're the only female characters currently in the game that MC can't straight up bone in the current ver. Add a threesome with Shurik and Baena? Turn Mom into a straight up whore and pimp her out?
The only 'updating' Avenger can really do outside of that is to add new scenes with existing fuckables. And that's fine and stuff, but isn't really that big a deal. This is one of my favorite games, largely because of the real pornstars he chose to include in their respective roles, but there just isn't much room left to expand in my opinion.