Touching my sister's breasts

I was admitted to a university in Tokyo, so I moved in to live with my older sister. She is extremely lazy. Even though we had divided the housework before living together, in the end, I was the one who had to do 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 do the housework for her. At first, she seemed reluctant, unwilling, but laziness overcame her sense of shame so she agreed.

And from then on, due to her laziness, I constantly got to squeeze her big, round, and beautifully full breasts. My breast squeezing technique was so skillful that it made her extremely horny! But just as she was about to climax, the time was up, making her feel extremely uncomfortable. And then, when she couldn't control her own horniness, 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 but continued to make me squeeze her breasts. Not only that, she even sucked my penis, inserted my penis into her vagina, and even let me fill her uterus with sperm! And from then on, my sister decided not to do housework anymore, making me do it instead, in return, I could continue squeezing her breasts whenever I wanted...