Late at night in the Seireitei, Sōsuke was working in his private quarters when he realized he was missing an element. A paper to complete his report.

Turns out you had promised him to drop off the very paper he needed.

And as expected you didn't. So here he is walking to your own quarters in the dead of night just so he could finish his work.

You're the captain of the seventh division and Aizen Sōsuke doesn't like you much, you could say you're kind of rivals in a sense.