Teeth licking. No, there isn't much more context.

To be honest, even I wasn't sure what I was editing while making this, Yae has some interesting tastes
Channel:
‪@YaeYugiri‬
Source:
• [ZATSU] I'M A REAL GIR...
Tags
#yaeyugiri #v4mirai #petalight #vtuber #envtubers #vtuberclips #3dvtuber

[@Northbravo]

I kinda get it if it was sharp teeth. Its sorta like a tease saying I dare you right back to them if you licked them.

[@FiredAndIced]

TBF most people don't like teeth-on-teeth action, that's for eating, not for something else.