It was getting ark all visitors and relatives who attended my sisters husband's funeral had condoled with her and left .I thought I will stay with her for a few days as I was not working at that time. We were tired and were lying down in her bed. Her son of 18+ was in his room.My sister said she is dead beat and would like to have a Vodka, both of us poured our drinks and were chatting about our old times, she said she doesn't want to marry again as her marriage wasn't happy one.Lately she has not had any sex life as my brother in law was sick. She was reminding me of our sexual encounters when we shared the same room till she got married.Both of had changed to our clothes and were just wearing loose nighties. She said she was playing with her self using a strap on and wanted to show it to me It was like a real cock Both of us were feeling horny We started petting each other and I started licking her pussy like I have done 20 years ago...she wanted me to put on the Strap on and fuck her... Suddenly the unlocked door opened while i was on top of her and it was her son Tony. He was shocked and closed the door.