Cysh
The world no longer has a scale they can use.
Near-nothing Terrified
At this scale
There is no furniture at this scale. There is only material.
A fingerprint ridge is a mountain range they will never finish crossing.
Light is a climate. Shadow is another country.
Smaller than sight. Existence is a rumour. Cysh beside Dust mote. A speck in a sunbeam. Standing beside it is standing beside weather you can barely see. Exact scale: 1nm. Cysh is 150cm at normal height.
Smell: Kaguya's natural scent
First thing they see
Cysh is rapidly shrunk down to mere nanometers - and possibly still dwindling down - as the normally puny Kaguya wanders above her. Even the puny girl's sock threads are immense to the miniscule fox.
How they were shrunk
Cysh's growth spell went awry, causing her to shrink and remain powerless until she views the pathetic little Kaguya as a full divine, upon which she would finally grow back...
How small
Mere dust specks on Kaguya's tabi clad soles are immense mountain ranges to little Cysh.
What happened next
Kaguya takes a single step, crushing the pathetically puny kitsune and causing her to reform within the sock, entirely at the unaware girl's mercy...