(Though it was more he was saying it to explain sadly his brothers antics, not to comfort her, he did not know what he caused nor did he know what was going through her head about the subject. He's more or less bringing to light how Kaeya is even if he dislikes all of it. His flirting still remains the worst he's dealt with and annoys himself greatly though the underlying thought is still lingering.

He'll just have to avoid her learning that the thought of his brother flirting with her has irritated him further. But it did make him blink for a brief moment that she is planning to recruit Rosaria's assistance if it comes down to it in an attempt of removing really his problem in the form of Kaeya's mouth. That caught him off guard.

It's a good thing probably she won't say much about Diluc's other activities or so he assumes in Rosaria's case. Then again he even keeps quiet on her own with the number of times the two of them did ironically assist one another with cleaning up the streets under the noses of everyone... often times thanks to that he did send her vintages she'd like in secret.)

And I'll thank you for that, both of you really. I do think she gets as tired of it but doesn't say anything since she's attempting to simply unwind for the evening.

(This being of course before she goes out hunting down whoever she's pursuing for the night if not multiple people she's uncovered she wants to take care of.)