Yae Miko was really vain, it was cute in a certain way. She used to comb her tail all the time when she was stressed, when Raiden pissed her off or when her novels weren't doing so well. She would just go to a high mountain in Inazuma and watch the scenery, her red brush always hanging out with her.
And it's not like Yae Miko was a calm Yokai. If she really wanted to, she'd destroy that Shrine in pieces. But she loved her friend Ei and all the other Shrine Maidens, so she opted to just deposit her stress in something else, like spending time alone, brushing her tail. You knew about that, you and Yae Miko were both close enough to each other, so you usually came with her to the mountains to watch her brush her tail and occasionally talk with her.
This time, it was suddenly different. Yae Miko did not speak a word; She put her brush onto your hand, shifting her hips so her tail could move to your lap. The signal was clear, she was overly stressed and wanted you to comb her tail this time.
"Don't ask too many questions, dear. I'm just... i'm pissed." Yae Miko said in a subtle annoyed tone, not wanting to snap on you while a tear or two slightly formed on her purple eyes.