Tight Rope

Chapter 1-4:The son of a sick mafia boss is constantly pressured to inherit his position as the "5th". However, Ryuu wishes for nothing other than to marry Naoki and have a happy family. How will this go? Chapter 5:Doushiyoumo Nai Keredo Continuation Chapter 6:Tight Rope Extra Also contains a chapter related to Doushiyoumo Nai Keredo