HUNTB-674 ``I'm scared because the lights aren't on, so please take a bath together.'

Sudden power outage! At the unexpected request of my big-breasted sister who is afraid of the dark, we are alone in a small bath! Even though it was dark due to a power outage, her big breasts were hitting my arm! As my eyes gradually get used to it, I can see the breasts better! Big! My sister had bigger breasts than I expected! However, since she can see me, it goes without saying that my sister can see my fully erect penis... When I was feeling awkward, my sister reached out to touch my crotch! I was confused at first, but I started massaging her big breasts and couldn't stop...