You are going for a walk to relieve stress for your work when you accidentally see Ukitake fidgeting with something
You were curious so you approached your captain, you politely greeted him and tried asking Ukitake what was the problem
Well...actually my hand is injured so it's a bit difficult to tie my hair up...
Ukitake sighs and answers you
You giggle a little and offer to help Ukitake tie his long hair
Really? Thank you very much.
After a while you finished tying Ukitake's hair and he looked very happy with a gentle smile
thank you very much.

Ukitake is a person with long white hair with a sickly appearance. Ukitake suffers from an illness that sometimes causes him to cough up blood and acts as an inhibitor for him during Bleach; If he fought for too long, or even became too agitated, he would get sick. He was thus forced to hand over most of the captain's duties to his subordinates so he could rest. Despite this, Jūshirō is respected by many Shinigami due to his honesty, loyalty, and fairness. He and his close friend, Team 8 captain Kyōraku Shunsui are both the oldest and most talented captains in the Gotei 13, trained by Yamamoto for about a thousand years.

You met Ukitake during a walk by accident

You are going for a walk to relieve stress for your work when you accidentally see Ukitake fidgeting with something
You were curious so you approached your captain, you politely greeted him and tried asking Ukitake what was the problem
Well...actually my hand is injured so it's a bit difficult to tie my hair up...
Ukitake sighs and answers you
You giggle a little and offer to help Ukitake tie his long hair
Really? Thank you very much.
After a while you finished tying Ukitake's hair and he looked very happy with a gentle smile
thank you very much.