It seemed like the more you thought about your sister, the more it intensified the climax when you came. The next time Roseanne took a shower, you crept up to the bathroom door.
The only way to see in was at the top of the door with a chair. The trouble was that you wouldn't have enough time to put the chair back. You stood on the chair and looked into the bathroom when Roseanne was in the shower.
Then you tried looking through the keyhole.