After reading a number of stories on this website about brothers using their sister's panties for sexual gratification, I decided to tell you about my younger brother's activities when he was in middle school.
At the time I was sixteen and my brother was fourteen. It was one of my chores to do the weekly laundry. While sorting out the soiled clothes that went into the washing machine, I noticed one day that my panties were damp. When I sniffed my panties I detected the distinctive odour of cum! My fourteen year old brother was jacking off into my undies.
At first I was going to complain to my mother. But as I held my soiled panties in my hand I began to feel a little horny. I realized that I had some kind of sexual power over my own brother. I caused him to have erections and to masturbate.
I put the load of wash into the washer and checked each time I did the wash to see if my brother was still jacking off into my panties. Without fail he'd repeat his dirty act two or three times a week. I never let on that I knew what kept him so long in the bathroom as he jacked off on my soiled underwear.
Truth be told, the thought of him doing his deed turned me on. So before I put the clothes into the washing machine I'd hold my cum soiled panties to my nose and rub my clit to a quick orgasm. I continued this practice until I went away to college.