Agree with you both on 2406, and that cuckquean content is rarer than it should be! There are some promising games in development with CQ storylines though, maybe golden years ahead? Recently read through Karen's Secret again (hood classic CQ path, but html only) and there are great scenes in Babysitters and Long Story Short with more to come. Nicole from Exciting Games and Ayumi from Blurring The Walls also have some promising CQ setups. They're the best LIs in the business imo, but Stef has really been growing on me.
EDIT: Should also mention NT00's catalogue, Yumi from There's Something Loose in Her Head is a gem!
This story has a good foundation that can be built up into a lot of distinct routes. The "wide" sharing stories with a billion characters like WVM can become a mess quickly, so I get why some are worried, but I think K4 hit a good balance. There are enough distinct personalities (directions to go in) to prevent author burnout, but not so many characters that it's tough to keep track of everything.