On the day I returned to my husband's family home for my father-in-law's third-year memorial, I found his unmarried younger brother living there alone. We were staying overnight, and my husband and I were chatting in our room. Late at night, I needed to use the bathroom but, unfamiliar with the house, I accidentally opened the door to the bathroom. There, I saw my brother-in-law's large cock. In that instant, my heart pounded and I felt overwhelming embarrassment—something that surprised even me. My brother-in-law seemed unaware, continuing his bath as usual. This incident affected my conversations with my husband, leaving an ongoing sense of awkwardness. And then, one fateful day, an event occurred that would drastically change the relationship between the two of us.