[URVRSP-048] [VR] brother Chi ○ Po loves [elder sister activity] life Mikatsu-san

My father and mother go back to their parents' house once a month to see their bad grandma. On that day, my sister and I were alone at home. Once a month... [Sister activity] day. I've been taking care of my sister since my parents worked together and were little. Even now that we're growing up, we're so close that we can be mistaken for a couple if we go out together. I of such an elder sister's has been found the place where masturbation is done in elder sister's underwear one day. From that day On, I came to play a role in fulfilling my sister's sexual desires, which I call [elder sister activity]. I am in the elder sister life once a month on the day when there is no parents.
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