Hi just a follow up on previous stories.After our naked hotub our sex life had exploded and we had brought Sam our brother n law into our fantasies.Elen had said she would never do anything with him out of respect for her sister but loved me talking about him fucking her with his massive cock. Well last week we had him and Elens sister over for weekend.After a lot of booze the sister went to bed.The 3 of us stayed up drinking.Sam mentioned the naked hotub and how he loved it.we all laughed and all agreed we enjoyed it.We then went to bed.Me and Elen had lovely fuck with me whispering in her ear I'd bet u would love Sam to join us.She came like a train.I then took the bull by the horns and said wait there and pretend to be asleep.I went to spare bedroom and motioned to Sam to be quiet and follow me.We moved to our room and I removed the covers to show Elen lying on her stomach with her big bare arse on full view.Sam couldnt take his eyes off it.i got into bed and started stroking her arse all the time Elen pretending to be asleep.I motioned for Sam to come over and removed my hand only for him to start feeling her arse.he then started to rub her pussy and finger her.He then took his boxers off and his big cock was standing proud.He was fingering her with one hand and wanking himself.he only lasted couple of minutes before comming all over her arse.We high fives then he left bedroom.I got back in bed and Elen said u happy now u dirty pervert.We soon fell asleep and in morning nothing was said but I'm sure the tide is turning.