"Jumping on Jade" is the submissive version of "Jiggering Jade", did you manage to unlock that one? For the scene to unlock you should have had sex with Jade two times (in Episode 2, 4 or accepting her proposal in 9).
Hmmm, could you load a save on the new game after the scene is supposed to happen and open the console (Shift+O) and type jade_submissive? If that value returns True I think I need to investigate further.
When are you checking the variable, it will be False in the main menu and throughout the game until Episode 12a? The jade_submissive variable is set in Episode 11. So if you were strict with her in Episode 3, 4, 5 and 7 the variable should be set to True in Episode 12a.
