I listened at the door!! Hearing a big middle-aged male start grunting, I knew my sister was in the process of destroying another man for her own sexual pleasure. I cracked the door open and looked in, my sister straddle an enormously muscled male spread eagled, handcuffed to a high wooden bench I had made for her out of barn timbers, with a "Y" at the bottom where his enormous balls hung. My sister slowly rising revealed a cock so big stretching her pussy so tight that there was blood on the shaft.. She was leading over, her right hand on his big chest supporting herself, her other hand held a cord attached around his balls which she would pull forcing him up to meet her downward thrust!! He was grunting and moaning as my little sister all of 17 kept riding him hard, milking him, slowly breaking him. As she had done to me two years earlier. Now he started whimpering. "Ok. Ok. OK no more please"! I'm finished I can't I'm finished, get off me!! My sister straighten up, and with girlish delight taunted him. What's the matter? Big guy! This little girl too much for you? You may be done, but I'm just starting. He screamed in pain as my sister yanked his balls up hard with the cord, and slapped across the the face!!! Satisfy me big man or I'll yank these balls right off you! Looking over her shoulder she saw me watching, smiled knowingly, and jiggled his balls for me. I being only a year older then my sister, had never actually seen a full grown man naked before, especially an older male so big and strong he must have been a body builder. His balls were ten times bigger than mind and, his cock made mind looked like a pencil. My sister motioned me to come in, and handed me the cord attached to his balls orderingme to fasten it to the ring on the floor which I did immediately pulling it tight. I could hear him grunt in pain as I tied it off. I stood next to my next to my sister then she put her hand out for me to help off him. Raising up! Her pussy pulled the big thing with her stopping just before the head popped out. she squeezed with all her strength trying to crush it with her vaginal muscles. With one last pull she let out a yell, causeing his hips to rise nearly ripping his balls off!!! Shakeing she got down with my help, her little nipples were standing out she rubbed her pussy her lips were hanging and stretched out. Her hand went to my shoulder for support. "God Billy clean me"Look his cum is leaking out of me!! Her hand went to my balls and tugged me down to my knees. Spreading her legs, her hand pressed the back of my head into her cunt, I started cleaning her with my tongue. Her clit was standing out prominently past her lips, as my mouth did its duty rubbing my nose on it as my tongue went deep. I could tell he had stretched her little pussy, his cum was coming out into my mouth in big gulps now and I swallowed it all as my sister had trained me to do!! My sisters finally pushed my head back, then pulled me by my hair to standing. She gently padded my balls. "You did a good job big brother"! My little cock stood straight out proud, and she playfooly slapped it, giggling she turned and pointed to the big limp cock that laid on her victims stomach. Isn't he magnificent? Look how big he is, he must be 250 pounds and look it's all muscle. Look how big his balls are Billy, this is a full grown man, and your little sister just took him. He was a magnificent specimen of a male. Someday I hoped to be half the man he was. To have big low hanging balls, and a bigger cock, and told my sister so! He laid quiet, his balls pulled tight by the cord attached to the ring on the floor. His big muscular chest rising with every breath, he was scared, he knew my sister was dangerous, a young female capable of anything, to young to consider the consequences of her actions. His cock started moving and swelling up again involuntarily trying to will it down, the more he tried, the harder it got until it stood its full 10 inches, the girth was amazing. Billy I'm going to castrate him!!!!! My sister slipped into her high heels and left the room, I watched her long legs and perfect body move down the hallway towards the kitchen.. The big mans head turned. Please help me!!! Don't let her cut my balls off!!! I lifted my little balls up for him to see. I still have mine because I do what she says!!!! She cut my fathers balls off when she was 12. and he had big ones like yours. "She's the velvet trap"
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