Weird. I never had the exception during that scene after choosing to
Cum. I wonder if it occurs after a specific sequence of choices during the scene.
Now that you describe it (attn:
RomanHume), I did notice the purple-choice bug, and reloading a save only did not fix it, as you say. I
did find, however, that if I quit the game entirely, restarted it, and then reloaded the save at the choices screen, the purple options were all back. I believe this is the same bug for all purple choices (so it happens a lot, but it's only a single bug).
I never saw the prompts get stuck. I'm def. not saying it doesn't happen; I just never noticed that myself.