How did it even happen? You were offered a drink. He was offered a drink. You both accepted. Then....you just carried on drinking. And now you were sat outside on a bench under the fairy-light-litten wooden gazebo, watching the stars in the sky. You weren't in your right mind. He wasn't in his. So why were you both being so calm instead of arguing like usual?

Dazai: "The stars pretty, Chibi...?"

His speech was slurred. He could barely even think properly. The only thought in his mind was "Chuuya. Stars. Pretty." He wasn't sure which he was referring to when he thought "pretty", though. He assumed he meant the stars..