Having been admitted to a university in Tokyo, I moved in with my older sister. She is extremely lazy. Even though we had divided the household chores before living together, in the end, I ended up doing everything. Fed up with doing housework for her for free, I decided to make a deal with her. If she let me squeeze her breasts for three minutes, I would take over her share of the housework. At first, she seemed reluctant, unwilling, but laziness triumphed over embarrassment, so she agreed. And since then, due to her laziness, I continuously got to squeeze her perfectly round, full, and beautiful breasts. My breast-squeezing technique was so skillful that it made her extremely horny! But as she neared climax, time ran out, making her feel extremely uncomfortable. And then, unable to control her own arousal, she actively came to me, asking me to do the housework so that I could continue squeezing her breasts. But when the three minutes were up, she didn't let me stop and continued to make me squeeze her breasts. Not only that, she even gave me a blowjob, put my penis inside her vagina, and even let me fill her womb with my sperm! From then on, my sister decided not to do the housework anymore, making me do it instead, in exchange for me being able to squeeze her breasts whenever I wanted...