GDTM-116 A miraculous turn of events unfolded on a hot spring trip with my sister! While I was sleeping at night, my sister, who has a bad sleeping posture, got into my futon! What's more, she was so close to me with her bare, big breasts and no bra on that I couldn't breathe, and it got me hard...

My parents were planning a hot spring trip, but I decided to go with my sister instead! I thought it would be a hassle to be alone with my caring sister who can't let go of her younger brother... but things took an unexpected turn! My sister crawled into my futon and had a bad sleeping posture, so her yukata was open, exposing her bare big breasts! What's more, when she turned over in her sleep, her big breasts were right in my face! I was so excited by the close contact with her that I could barely breathe, and I got a full erection! When my caring and kind sister noticed this, she tried to calm my excitement... and we engaged in forbidden incest!