Realising what was coming, my sister started screaming into her gag as they quickly undressed her and threw her on the couch. One got on top of her and quickly opened his pants. I can still see the look of horror on her face as he penetrated her. He frantically r**ed her, then his partner did likewise. I just stared in shock, unable to believe it. I thought they were going to break the couch. After they'd both come, they calmed down. When they started r****g her for the second time, they just took their time.
And, watching the bare backside thrusting between my sister's legs, listening to her sobbing, and seeing the hopeless expression on her face as she was r**ed at a nice leisurely pace, I started to get hard. By the time he'd come and his partner was having his second go, I was on the edge...and I ejaculated into my pants. I cried out loud enough for all of them to hear, and my sister's eyes were on me in a shot. The look of betrayal on her face when she saw me gasping breathlessly as I came and then looked down at the spreading wet spot on the front of my shorts just made me want to curl up and die.
She's never forgiven me, even after 20 years. It's bad enough that I couldn't protect her, but I can't offer any defence for coming as she suffered the agony of losing her virginity to r**e. She tolerates me for the sake of our parents but, when they're gone, I know I'll never see her again.


