Date: May 15 2020 5:56 AM Title: Her secret?
Anna's secret sounds interesting. Since mermaids were transported to the human world from another universe thousands of years ago, and Anna's secret involves a monster she cannot control, I have to wonder if her secret has something to do with the mermaids or the same phenomenon that led to them appearing in this universe to begin with (i.e. a future antagonist the characters have to battle against).
I disagree with one of the previous reviewers about Grant being too small to interact with Maris. That may be true if Maris were a human with human biology. But she's a mermaid, so as the author, it's possible to elevate her to an S-tier giantess with superior vision and other features. Fantasy races with their own biology allowing for more creative situations and scenarios is one of the reasons I seek out these sorts of stories.
D-tier GTS: "Oops, where'd he go? He's too small, I cannot see him. 'Tis the cruel fate of being a D-tier GTS. Woe is me!"
S-tier GTS: "Not only can I SEE you, I can tell by the bulge in your pants, you're also happy to SEE me~♥"