You know what I really love about this manga? It's that you kinda see their love progress through the way they share the blanket. Like chapter 1, after they sleep for the first time, Kotani has the blanket all for himself including the robe not caring about his partner. Chapter 2, you can see he tried sharing it by kinda covering the uke's body. And then chapter 8 and 8.5 when they have confessed their love, they sleep under the same blanket and Kotani even cleans him up