Sorry, I got my threads crossed. So don't know what to tell you. I had a save before the choice was given, and did sit on the bed vs. be more dominate. That allowed me to get that one opened up.
Worked fine for me. So that tells me something about your pc with file permissions, or maybe there could be some in advertant value in an if check code statement that isn't allowing it to be done.
My best suggestion for you would be to start from an earlier save, and run through to that choice point, then save.
Then go both routes and see if that will open it up for you. You may have to use a spare slot to do a save after watching to make it stick. I've seen that happen with some games. Not sure how the OP has it coded. Looks like if I really get bored I could go through the files and see if there is some odd code or not. But not tonight.