MIAA-384 Until morning with my girlfriend's sister who became a refugee after returning home due to a sudden heavy rain... Rin Kira

I was thinking of marrying the girl I live with. - She has a younger sister who is a little older than her. - My name is Rin…. - He is friendly, already calls me big brother and talks to me in a friendly manner. - One day when it was raining heavily, Rin came to our house to take shelter, soaking wet. - ...The power went out due to a big lightning strike, and the moment I hugged Rin and touched her body, my rationality was blown away and we had raw sex...Even though I felt a sense of immorality, we continued to do it in the bath, after dinner, and just like that until morning. - Seeking each other...