Augustine's Links
Augustine is probably one of the only people who can tell how Frost is feeling from just a look. Maybe it's because August has done so much research, maybe it's because August himself usually has a stern face. Whatever the reason, he has no trouble seeing and interpreting the tiny changes in expression and body language that Frost displays.
Frost loves August very much. As the only person Frost has ever met who can read the Pixi's emotions, Frost is always very touched when August is able to respond to his feelings appropriately without having to ask.