There is apparently some way to get it to work with Cheat Engine, someone posted it a few pages back, but I've not gotten it to work.
I did, and it's really tricky. But you need to swap between positions and then trigger the "9 scene" that triggers the titfucking, which then triggers the animation for thrusting, which you can get by swapping back to positions lower than 9 (1-8).
It's kinda wonky though, so once you triggers that animation, it overrides the bathroom as your permanent background. It also persists if you save and load, so don't save over your saves if you do this.
How to: Search for values between 1-7 when during the bedtime fun scenes, and search for increases/decreases in values when you swap back and forth. Regular laying on back is 1, then side is 2, stomach is 3 etc, so you know how to manipulate the values up and down.
Then once you' find the values that goes from 1-7 you can experiment by changing the values up one step and it should move her eyes or panties into position. Once you've gotten that you can force her other positions.