I'll try to tackle these one by one.
1. If you mean that there are no more rituals unlocking, that's how it's supposed to be for now. The threesome is the last ritual currently.
2. That part is not in the game yet, sorry. It's just some setup for the future.
3. Hmm, I think I might've fucked up something with her quest. I don't think you're missing out on anything with her right now though, so feel free to ignore Serena for now.
Umm, I don't know which parts you've done, but possibly. If all of the character's hints in the journal say "IN DEVELOPMENT" and you've seen all the club events, you're at least very likely to have seen it all. There might be a semi-hidden scene here or there, but nothing major anymore, I think. A new update is coming soon though, heh.
Like the scenes with Cindy or Bella. If Cindy's affection and corruption are high enough, she'll sometimes interrupt your coffee dates with the girls. And as for Bella on weekends, she'll leave the shop unmanned during the Dusk and you can browse her books, and if you browse the right stuff, you can do naughty things with her in the Bar once it's Night.
