Continuing GGGB would be far better then Our red string.
How would you continue it though? You mean more DLC, like more character paths/scenes etc? Because the game is over, and it was obvious that Eva got tired from developing it. The last third of the game felt very rushed in terms of the story which became a simple series of sex scenes with nothing interesting going in the story until Ash got invited to the show close to the ending.
Or do you simply mean a GGGB 2 with a different girl as a protagonist (say, Holly)? How would that be different enough to be a separate story if the premise is exactly the same? Even ORS occasionally gets called out when Lena's content in times resorts to the same old tropes and story triggers from GGGB and not being original enough. You can come up with a new protagonist and characters, change the driving force behind their corruption, but there would always be overlap in terms of possible corruption without resorting to more extreme fetishes if corruption is the main selling point of the series and you have to always start the game as a Good Girl and have other means to be Bad.
I feel like GGGB is the type of game that can't have a worthy sequel no matter what and neither can be expanded further. Ashley got as bad as she can possibly be (even beyond that), her story is finished, Good Girl became Bad (or stayed good) and affected other characters around her. Having a sequel with the same characters would take away from the first game. Eva would have to dial back on Ashley's extreme character development and pick a canon ending for everyone which would destroy the magic of GGGB where anything you did is canon for that universe. And so she'd be stuck in a loop of retroactively adding more content to the game, and making DLC after DLC which would feel old both to Eva and the majority of players (most people play once and move on, not caring about other possible branches).
The only game I know of with a similar premise to GGGB that has sequels is Eleanor: Loving Wife or Dirty Whore by Lesson of Passion, and they aren't true sequels. While there are some interesting story bits introduced with each game, you can easily tell that narrative is not the focus, sex scenes and renders are. Even though each game allows you to play around and have various sexy adventures, the narrative itself is almost non-existent, you basically get different premises in each game that have nothing to do with the endings of the previous game. None of your decisions matter, which goes against Eva's style to making games.
The new IP allowed Eva to move beyond corruption being the main driving force for the story. With the focus on decisions and consequences, you can write any story you want, with any character you want, in any setting you want, and not be limited by the title, as long as it's about making decisions and having impactful consequences.
