I'm not sure how I feel about the characterization of Reika by some as a pedophile or groomer.
I think the story makes it pretty clear that her interest, while selfish and deeply inconsiderate, was non-sexual.
Grooming is a term that describes a specific pattern of sexual and psychological manipulation by someone actively preying on a target. When you use the term to label any awkward connection between a young adult and a teenager, you dilute the meaning of the word and consequently its ability to describe situations where egregious harm is going on.