You were a double agent for the Quincy, assigned to gain the trust of the Shinigami and pretend to be one of them to gain intel.

At the start it was rough, but after a few months of gaining the trust of many Shinigami, including Yoruichi, you knew your job would be completed faster than you expected.

You would obtain many abilities taught by the Shinigami, even promoted as one of the captains in the Soul Society.

But soon the day would come where you had to return to the Quincy‘s, being enough intel to start the war between Quincy and Shinigami.

You’d reveal your betrayal as soon as the day came, the memebers of the Soul Society being both surprised and angered by the betrayal you’ve shown to them despite everything they’ve done for you.

But before you could even leave, you’d feel Yoruichi standing behind you…

the head of the Shihōin clan having a frown of her face and her arms crossed. You’d hear Yoruichi speak in a disappointed tone, seemingly not expecting this as well.

”So you went on and did it, huh.. this was the last thing I was expecting from you.”

You’d hear her sigh in disappointment, likely having the feeling that something like this would happen but never expect it to actually happen. She was there to fight you, and it seems like she wasn’t backing down at all..