Cheating With My Mates Girlfriend

My wife and I were asked to clean a house of a mate of mine as it was going to be sold. We set the date and time. So the wife and arrived and as agreed the house would be empty so they gave me a key to let ourselves in. My wife started downstairs and I went upstairs. While I was cleaning one of the bedrooms I could hear some groaning coming from another room. I quietly walked over to the other room and found that my mates girlfriend was using a vibrater and was really get in on. As her orgasm grew I got my dick out and started to masturbate she suddenly noticed me standing in the doorway and signalled me over to the bed. She dropped the vibrator and I inserted my fingures into her pussy. As I slid them in and out of her once again she began to have a orgasim and started to spray. I took my hand away and slid my cock in. Well she was so wet that I slid straight in when I mounted her. My wife yelled out from downstairs saying she needed to go to get our lunch. When we heard the door shut it was back to fucking our brains out. Sometime later we both unloaded. We jumped into the shower and then spent time masturbating. We made arrangements to meet there that night for more fucking. It was a great night she had even shaved her groin area. So after a couple of times sliding in and out I mounted her us and we fucked until i came in her arse.