Back in the day I had this thing about wearing my older sister's bra and panties. Being home alone I went into her room and grabbed a sexy set from her dirty laundry. I slipped them on and proceeded to the family room to watch a porno I found hidden under dad's bed. Getting into the movie, I slipped my cock out and slowly started to masterbate. Oblivious to my surroundings I never heard her and her boyfriend come home. I looked up when they started laughing. Embarrassed I tried covering up but it was no use. I thought I was going to be in all kinds of trouble. At the least they would tell all their friends. To my surprise they sat on the couch next to me. Told me to finish what I was doing. Reluctantly I slowly started stroking my cock again. I didn't take long to get hard again. Stacy replaced my hand with hers as her BF slipped his hand up her skirt. I looked her in the eyes. She gave me a wink and leaned down to put her mouth on me. Her BF took the opportunity to drop his pants and walk up next to me. Said if I wanted to be a girl he was going to treat me like one. Next thing I know I have his cock in my mouth. It didn't take long for all of us to cum. The afternoon ended with me eating his cum out of Stacy's pussy. That was the start of my experience with her but not my last...