I am Koji Onogami. I got married to Wakaba three years ago, and we've been getting along well as a couple. About half a year ago, my sister's family moved nearby and started coming over to our place often. My sister, who has always been wild, was having sex with her brother-in-law at our house the other day, and that's when I found out he had quite a large dick... Anyway, I thought our marital relationship and family dynamics were harmonious... but the other day, I saw my wife embracing my sister's husband.
