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I hadn't really paid much attention to it, but my sister (Mirei)'s breasts had gotten bigger. My sister wandered around the house defenseless. She was talking to my mother about how her breasts had gotten bigger. When I looked up, I was like... What?! Her breasts are so big? I was thinking of an excuse when I poked her breasts while she was sleeping and she found out, and she said, "You can touch them. They say they get bigger if you rub them." Now that I had my excuse, I was absorbed in my sister's breasts. I pulled down my pants in front of my sister and had her do a titjob. It was the best... I only intended to do it once, but Mirei came home with her uniform soaked from the rain, and her breasts were showing through her bra after club activities... I couldn't forget the pleasure I felt last time, so I did it again... She was about to go out in a sexy outfit that boys love, so I dragged her back and monopolized my sister's breasts. I'm sorry for being a crazy older brother. But it's Mirei's fault for having such amazing breasts. Yeah.