Glad you enjoyed the game Roben!
First of all, yes, the story is still not done. We're about 2/3 of the way through with the main story, and we can always add side content like R&D projects, exploration rewards, daily agenda side quests and guest scenes. We're taking a break at the moment because the latest build took a lot from us.
As for NSFW content, yes there will be more. I think the one Luke scene that is in the game is a little intense (we're planning on giving his whole intro a bit of a revamp since it kinda clashes with the game a little too hard and we've seen people streaming on SFW mode horrified, worried that any second now they'd get their video demonetized) but we plan on having more between the characters that can be paired up, especially now that the Mc and Asterion are a couple.