I lived with a step-mother and her spoiled brat son, who was fifteen to my eleven. He could do no wrong, and I never could do anything right! He began tying me up, and playing with me, until I began to experience an erection for the first time. It was so intense, it drove me crazy, and I would have stopped it if I could! He was much bigger and heavier than me, just like our "mother" and always got the better of me. Then one day she found us, as we "played". "Cowboys and Indians" explained Cecil, coolly. "Not sure THAT happened between them!" she joked, then asked me "You okay with all this?" "He LOVES it!" cut in her son, and she accepted that, as he could do no wrong, after all. So my confinement grew ever more inventive, and the torment ever more intense, until he had to gag me to keep her away. It was a power thing for him, and he loved my humiliation and discomfort, sadist as he was, ever more fiercely. As she got older and more lonely, he began carrying out his torment right in front of her, forcing me to beg him never to stop, never to let me out of whatever I was tied up in! There were a few mumbled "I'm not sure this is right" and "Are you SURE you're okay with this? addressed to me. As usual I was scared to say anything but the agreed upon "Yes Ma'am!" At eighteen, Cecil actually dominated his Mom, mentally, ordering her about, making her do whatever he said! He demanded that she play with me, and he took polaroid photos of this, and began threatening her blackmailing her, saying he'd take them to the police! After that, weak-willed gullible fool that she was. she allowed him total control in the house, down to the tiniest detail! He began tying us both up then, and leaving us like that for entire nights and weekends. She cried a lot, and the only way I could calm her down was to work my bone-hard erection inside her, which he thought was 'adorable' snapping more pictures! Finally he got a job out of state, and it was just her, and me! Awkwardly, embarrassedly, we agreed that our physical contact was intense enough we wanted it to go on, and so it did! She was claustrophobic, and he always enjoyed roping her up in a sleeping-bag, head first, as he savored her fright and utter helplessness. Only my involuntary attachment to her, kept her sane, I think. To my surprise one day she asked if I would tie her up in the sleeping bag again, explaining that she trusted me, and that was all it took! Soon her claustrophobia faded, and I had a hard job getting he to come out of the bag! It was the happiest I'd seen her for ages, so I made her stay like that, most of the time, as she played with herself endlessly. She breathed through the metal zipper that ran right down the middle of her face, and began insisting that I tied the neck of the bag under her feet, so she was utterly trapped. I could open the double-ended zipper at her face, to feed and hydrate her, before sealing her back inside, as she demanded. I could undo the neck, and sit her on the potty, as required, and like that, had access to her sex too! I fucked her brains out, with the enthusiasm of an eighteen-year-old, and this seemed to make her very happy! Now this was fine and dandy, except I wasn't getting any tying up myself, or forced handjobs! Then one day Cecil returned, job lost, and soon there were two trussed sleeping-bags on the master bed!