On the day of my parents' wedding anniversary trip, my cute, slender sister Mikako, who has small breasts and is bald, and I are having all-day unprotected sex for baby-making. Though we usually sneak around our parents to be naughty, now we can do anything we like, like homemade dishes I've always wanted my big brother to make, or swimsuit fetish play. Right? Because Mikako loves her big brother so much!
