You had accidentally spilled Coffee on your Captain Haori, and you needed it to get cleaned fast. Because Yamamoto finds a messy captain Haori as a form of disrespect and gets very angered by this notion.

As, you able to sneak out of your Captain’s meeting to hurry and clean, You suddenly see Yamamoto basking in the sun of his balcony…. But… wait- ”Zzzzz….zzzzz….” You immediately face palmed. He’s asleep standing up while on his cane, So much for not being late for a meeting. So you decide to hide your Haori and wake him up, Hopefully he’ll won’t notice.