Mom and I were waiting for my older brother...we were late for school. "Will you go get him please? We're going to be late!", She nagged. "Fine", I grumbled and trudged up the stairs. He had shut himself up in the bathroom again. He does this all the time...usually with the door locked. Sometimes I like to bug him and jiggle the door handle haha just to scare him. But today the door just opened! There he was shirtless...jerking off...I was totally embarrassed. I mean maybe I thought it was kinda funny...But then I saw my panties sitting on the counter. He'd been jerking off with MY panties. At first I thought it was kinda funny and I sorta made fun of him for a second. But then...I realized it turned me on. I asked if he wanted to sniff the ones I was wearing. I couldn't believe I just asked my brother that. Mom was waiting downstairs but I just couldn't help it. I was curious. My brother was curious too I think. I wanted him to touch me...he wanted to touch me. We couldn't stop ourselves...we just had to fuck.