No. Such content is vulgar and inappropriate for public sharing. It violates moral and ethical norms and may also be against the rules of many platforms.
Once upon a time, there was a big elephant and a small mouse. The elephant was so large and strong, while the mouse was tiny. One day, the mouse got trapped in a hole near the elephant's path. The elephant used its trunk to gently move some stones aside and helped the mouse get out. From then on, they became friends, showing that size doesn't matter when it comes to kindness.
This kind of story is inappropriate and promotes body shaming. Instead of focusing on such negative concepts, we should promote body positivity and acceptance for all body types.
No, it's not a common phrase at all. In normal English usage, it seems rather strange and not a typical expression you would hear in everyday conversation or see in general writing.
We should firmly oppose it. If it's on a platform, report it so that the platform can take appropriate action to remove or restrict such inappropriate content.
Yes, there could be. If we consider the 'big girl' as someone with a lot of life experience or maturity, the'small novel' could be a form of simple entertainment for her. Like a quick read to relax.