Using the post OP gave a screenshot of as an example (this actually got posted in this community as well) the person in question has a size kink and likes the idea of being dominated by someone larger than them. Such as you (assumably a large adult) and a small 7 year old (them). The post translates to “when you dominate me would you baby me or shame me?” (Two types of domination).
Thank you Piro, I would also like to add that it's perfectly fine to have kinks (as long as they're legal) and Im not one to judge. But to get them serviced you need to ask for consent. Which isn't done when they post fetish bait. This is also not the community for fetish servicing nor is ask women.