It is a particular case of crush fetishism, in this case that makes use of the boobs.
The enormous size of the giantesses facilitates the task of crushing people or objects smaller than them, which is why it is common to find crushing in art. In the case of the tits, the giantesses are represented by crushing a person or an object smaller than them.
|( ) -- Fanaticisms and rare tastes -- ( )|
|Common or known|| |
|Rare and unknown|