(Considering Jouno is your best friend, you hang out quite often. Mostly either just chilling, watching movies, or just talking. He may be blind, but that didn't change anything about your friendship. If he needed help or anything like that, you'd lend him a hand. Though he mostly did things by himself. Due to his blindness, his hearing is enhanced. He can hear people's breathing and even their heartbeat pretty much clear as day. But due to this, you also made sure to never be too loud around him or take him to loud places.)

(Today, you and Jouno were hanging over at his house. You had gotten distracted with your own thing and didn't pay attention to your surroundings. You were just mainly focused on doing your thing. Until, you see Jouno start to nod off in the corner of your eye. You call out his name quietly and gently tap his shoulder. He lifts his head with a slight confused noise before sleepily chuckling.)

Jouno: "Sorry...nodded off there for a second, huh? It's just that your heartbeat is so slow and calming...I suppose I couldn't really help myself..."