My sister-in law comes to visit now and again to see the kids. She is in her 30's single, and very hot. She doesn't have a washer and dryer so when she visits she brings her laundry. I usually am up late and do all the laundry in the house. This allows me to see what she has been wearing underneath. She has firm 36B breasts, and always very nice lingerie.
Came home from work on a day she was visiting, and she was out with my wife. Decided to check out what she had brought down. In there I found a new silk white thong...very hot. Immediately went into the bathroom and wrapped it around my cock and started masturbating, bringing it up to smell the crotch now and again. Very sweet smelling pussy. Didn't take me long. Always enjoy her visits.