A particularly cruel giant might tune the temperature in the room down so low that their tiny pet would have to snuggle and rub up against that massive cock for wormth~!
Those eyes, she’s trying to figure out her next move. Plotting to escape maybe? Or perhaps just trying to think of a way out of having to touch that dick?
If you read the captions of the associated image-story, the giantess here caught the shrunken woman cheating with her (the giantess’s) boyfriend and shrunk them both.