I know I'm probably missing the original idea Khyle had in mind for this one, but after noticing how Kikuri is sinking her fingers in the beer glass, and her black nail polish, I can't help but think in some old news about nail polish which changes its color whena drink contains drugs, so this can help women to prevent being victims of malicious men.
Yeah, it really sounds like a crazy idea considering this news are pretty old, but this kind of implications are not-so-out of place coming from Khyle.
A trick some low life do is to put drugs on the fingernails, so when u put a finger in like "how it taste" type of joke is in reality just a little bit of a narcotic on your drink