"Hit the jackpot last night the wife's sister is staying with us for a couple of weeks on holidays and long story short I was working and wife was visiting friends so her sister was house sitting for us.
I ended up finishing work early and headed home got home and heard her sister was in the bedroom chatting away to her husband online or on the phone anyway after a few minutes the chatting stopped and I heard what was definitely sexual moaning coming from the room I snuck halfway up the stairs for listen and couldn't help myself I just started wanking off and came in minutes snuck back and watched TV after a while I heard her running to the bathroom and into the shower when she finished I made a bit of noise to let her know someone was home she popped down for a chat and watched the TV I headed up to the bathroom and her panties left on the floor no other clothes they were soaked in pussy juice wet and sticky they smelled fantastic I pocketed them for a wank later can't believe it I definitely think she is leaving them for me to find and use"