wife's parents house

we were staying at my wife’s parents while they were away. It was me my wife and her sister and husband. The house is a converted barn with a sky light in the upstairs bathroom. It also had a skylight from the bathroom to the loft. Anyway, the wife asked me to get some duff down for her. As I was stood near the window I noticed movement. Looked don and saw my sister in law turning on the shower in all her naked glory. I took in the view and finished my task. Only regret, I didn’t have my camera on me.