I have a headcannon that Hanzo has really bad social anxiety, and when everything gets too much its sometimes the little things that help him calm down. Like a specific incense, his brand of tea or maybe little snacks. Jesse notices this and makes sure Hanzo never runs out.
Hey there, thank you for the headcanon! (and the follow <3)
Jesse also always carries some of Hanzo’s favourites with him. Especially when they’re undercover somewhere and have to play up the mobboss and his bodyguard. No matter who plays who. If there is a huge group of people then there is Jesse with a small bag of snacks or a small thermos with Hanzo’s favourite tea.
And when they get the opportunity? Jesse wraps Hanzo in his own serape because the warm scents helps him refocus.