Her Naughty Knickers

Couple of evenings ago I went to shower shortly after my wife finished and found her worn knickers in the hamper. They were actually still warm and a little damp from being worn all day.
My wife is a very clean person but there were some very small marks in the back part of the gusset. I got a bit of a semi and sniffed them as I had a wank, being so randy I imagined licking her bum. Never happen but in my dirty mind I hear her bent over and exhorting me to clean her dirty little arse.