Inspired by the poster above and Ana's gigantic mouth I went through her Twitch clips and compiled a few interesting videos. Lots of variety, from wide mouth opening and fixing hair to showing tummy and tight outfits.
These two vids have some good cleavage, but I was unable to find anything amazing. Maybe someone will be luckier.
There was some good content on others IRL chess stream, but they aren't on Twitch anymore.