You dont know.

She waited for an answer. one you were unsure about. you didn't know it was all so exciting, but she is your sister. "I don't know..." she lowered her self on top of you maintaining her erection and hilted penetration. "What do you mean? You've loved every minute of it." She was talking in his ear. Some of her hair had caught on her lip. "You're my sister. and were not even twenty." she kissed you on the neck. "So what. it's not like your going to use your clit." the word sent a shiver down your spine. "Maybe if we have kids. I'll have to pump you full of viagra or we'll have to get it done artificially." Your words almost caught in your throat. "Babys?" she whispered in your ear. "We can have a few if you want. Not now, maybe in a few years." She slowly started to rock her hips. "Maybe I could put one in you? there are a few companies trying to make bois breedable." You didn't even know you wanted that. "I don't..." She whispered in your ear again. "Do you even want a choice? racking your cute little head. trying to think like a man." Her rocking turned to light thrusts. "Your not a man is you." She was hitting all the right spots. You manage a whimper. "No." She sped up. "What are you?" She scratched along your chest, causing you to yelp like a scared animal. "A boi." She kissed your cheek "Who's boi are you." she had gripped your collar and started to kiss and nibble your shoulder. the bites got harder and the kissed fewer as your silence annoyed her. Until you meekly with short breath mumbled "Your boi." She stopped, "Properly." she grabbed your hair making sure you could say it loud and clear. "I'm Sarah's boi." She enjoyed that, she was breathing heavily. "louder." If you weren't caged you would be as hard as diamond. "I'm Sarah's boi." She was practically pounding you into the bed. "I want mom and Cristal to hear us. scream it!" Scared you said it a little louder. "Scream it, Dougy!" She slapped your butt. "I'm Sarah's boi." You shouted it as loud as you could. if they didn't hear it you would be surprised. Clearly satisfied Sarah started pumping you full of her seed. more than usual. she didn't usually last this long. she nearly collapsed on top of you. "At dinner tonight. your going to give me a blowjob, I want Both of them to know your mine, and no one else's." Weak and tired. You could only nod in submission. She owns you. If today had thought you anything. She knows what is best. "I don't want a choice... not any more." she kissed your cheek. "I know. but now so do you." She grabbed your hair pulling her self out of you and moving you to clean her as she grabbed the plug, it had been charging on the side. In on swift shocking movement, She plugged you as you attentively cleaned her cock.

Later at dinner. both your mother and Cristal were silent. Following Sarah's instruction, you got under the table. all of them exposed them selfs IT was like Sarah could smell the challenge. "What are you doing?" Your mother spoke up. "You can't just claim him, We should share at the very least." you could see her legs tense up. "Like fuck! I already started training him." Cristal Defence her self. "That was moms choice I didn't get a say." Sarah was having none of it. Both your mother and cristal tried a poor attempt at encouragement. "Dougy you have to choose." Sarah's legs relaxed. "Dougy suck." And you did as you were told. "Make it loud." the sound was clear, and both your mother and cristal were utterly defeated. Mabie there would have been a choice. Maybe they would have won you if Sarah hadn't started to train you. She knew how you liked to be treated even if you hadn't completely accepted it your self. She had dominated the household in defending her claim over you. You could tell she was going to reinforce her control over the house. no doubt with your help or at least submission.

On Monday you have school. but Sarah has plans. what are they?