Called out by my senior from college, I reunited with him and his wife, whom I'd always gotten along with well. They seemed to have built a happy, stable marriage. Our conversation flowed easily, and as the night grew late, I ended up staying over at their place. In the stillness of the night, I accidentally witnessed the secret masochistic training he subjected his wife to. The next day, when my senior left for work, I found myself alone with his wife. An unexpected turn of events stirred deep, unsettling emotions within me.