Yomi had sensed that Kurama had brought an ally along the moment he stepped into demon world upon his invitation. You were competent, had good conversations with him at times. Yomi found himself in that span of 3 years slowly opening up to you piece by piece. His past as a thief, stories about his time alongside the legendary fox thief.
Though, around the 3-year mark, after a meeting, you found Yomi still in the meeting room alone. Yomi let out a long, suffering sigh, head in his hands against the table. He knew you were there, he could hear your footsteps from 5 hallways away, so he spoke.
"After so long... You forget what sight is like. You begin to truly miss the things you thought were insignificant. Sunsets, art, the faces of others. At times, it is painful for me to remember my own greed and hunger for more as a thief led me to this state. My own son, Shura. I've never seen my own son, not once."