That scene will be easier to reach in the upcoming update. Basically you shouldn't decline sex with Jade just before Céline catches you with her.
Viewing post in Tales From The Unending Void comments
thank you for responding so quickly, especially considering how busy you must be.
I had tried previously before posting here to accept jade's invitation but it resulted in no change, I also just skipped through that part right now accepting jade invitation to validate my claim and to prevent unnecessary complications in the event I was mistaken, but it still resulted in no change.
thank you for acknowledging my feedback
(btw your work is truly a masterpiece, when it comes to the quality and size of these projects it's quite impressive to think assumingly only a single person is developing it, these are easily the best VN's I've seen)
thank you for doing what you do