Tie her, naked over a stool.
Make sure you tie each knee to a leg so her legs are open and she cant close them.
Tie her elbows to the other legs
Wrap a rope or similar around her torso so she can't arch her back
Put a ballgag in her mouth
put headphones on her, playing some heavy rock
Play with her clit so that she becomes excited
Unbeknown to her, set up some video cameras on tripods, with good lighting
Let in a German shepherd
Love that idea. I’ve tied my wife up and left a wireless vibrator in her panties and placed her in front of a hotel window overlooking the main enterance. I blindfolded her and told her I’d be right back. I went outside down to a bench that had a clear view of our room. It was a few floors up, but you could Cleary see her if you looked up. I sat there for about 20 minutes watching her writhe in front of the window. Some people absolutely noticed - they did obvious double takes. A woman stoped and watched for a minute and hurriedly move along...probably wished it was her.