Even funnier due to the fact that Beidou is an airhead and doesn't realize why Ningguang was mad in the first place. Now she's confused on why Ningguang is sadistically smiling at her.
A passage from The Lesbian Monster Encyclopedia: A Guide for Safe Sapphism.
"The scales of the golden dragon are normally dense and tough, but change with the level of arousal: From stiff enough to deflect the strongest of sword slashes to the skin texture of a young human maiden when ready to mate."
@Perlen297 Since Kaede literally freaked out hilariously to see Riri and Yuyu holding hands with only their underwear inside that ball, there's no doubt why she would have imagined the two of them doing "something forbidden" for such a long time.