Keyholes are wonderful!!! It's a shame that they'll be a thing of the past soon!
Someone should create a Keyhole App. Ya know, for when your wife is alone in your bedroom with her man, and she wants to let you watch, but he doesn't want you there. She can put her smart phone near the bed and sissy can use the corresponding Keyhole App on her phone to watch, as if through a keyhole. What do you think sweet girl?