I was accepted into a university in Tokyo, so I moved to live with my sister. She is an extremely lazy person. Even though I divided the housework before living together, in the end I was the one who had to do it all. I was so fed up with doing housework for her for free, I decided to give her a condition. If you let me squeeze your breasts for three minutes, I will do the housework for you. At first she seemed reluctant, unwilling, but laziness overcame shame so she agreed. And from then on, because of her laziness, I continuously squeezed her big, round, beautiful breasts. My breast squeezing technique was also extremely skillful, making her extremely horny! But every time she was close to reaching the top, her time would run out, making her feel extremely uncomfortable. And then, when she couldn't control her arousal, she proactively came to me and asked me to do housework so I could continue to squeeze her breasts. But when the three minutes were up, she didn't let me stop and continued to force me to squeeze her breasts. Not only that, she also sucked my cock, put my cock in her pussy, and even let me fill her uterus with sperm! And from then on, my sister decided not to do housework anymore, forcing me to do it for her, in exchange for me being able to continue squeezing her breasts at any time...