Tbh I don't really understand grooming concept.. let's say, you like your school teacher first.. then you flirt with him.. then you guys decide to be together when you're adult.. I don't think that's grooming.. I think it's the same with parent-child dynamic except incest is a big no go.. it's weird to like your own family members
In your example, this isn't grooming, although its questionable, bc what type of adult looks at a kid and says, yeah, I'd like to put my dick in that, once they grow up. Its kinda gross.
Grooming is more taking advantage of someone who doesn't know any better because they're young or damaged in some way.
Why is it that when i think I've encountered myself a parent-child family dynamic in manhwas it turns out to be grooming?