Plot Summary

My Older Sister Was In The Picture Of A Saffle That My Senior At Work Showed Me! My Older Sister, An Ultra-straight-minded Fucking Serious Who Is Always Talking To Me, Was Glad To Be Cheated By The Opposite Sex For The First Time In College, And She Became A Yariman Immediately! A Senior Invited Me To 3P Next Time When I Was Shocked! I decided to participate because I wanted to mess with her older sister. On that day, her older sister was surprised and tried to run away, but she caught her and had a threesome with her senior.