After I Transmigrated into a Book, a Possessive Mermaid Wouldn't Let Me Go [GL]

Blurb:

On her way home from an exhibition, Fu Tingjin picked someone up.

A beautiful little girl named Zhou Yin, sweet and obedient, but unfortunately suffering from amnesia.

Fu Tingjin had picked her up, and now she wouldn't leave her alone.

Fu Tingjin: I'm not adopting you.

But she ended up on the road to becoming a full-time nanny, never to return...

The girl couldn't eat or get dressed, so Fu Tingjin patiently taught her how;

The girl loved beautiful jewelry, so Fu Tingjin spent a fortune buying her all kinds of precious treasures;

The girl was too scared to sleep during thunderstorms, so Fu Tingjin sang her lullabies to soothe her to sleep;

Then one day, Fu Tingjin happened to see a news story from six months earlier:

"A female mermaid escaped from the XX Biotechnology Museum on July 18, 3031, Stellar Calendar. This species is extremely aggressive and possessive, and is skilled at using its beauty to bewitch people. It eats raw meat and is classified as mysterious and dangerous at level 3S+. The public is advised to stay away to avoid injury..."

Only then did Fu Tingjin realize something was wrong.

Zhou Yin wasn't incapable of looking after herself. She just didn't have clothes underwater.

She hadn't forgotten how to use a knife and fork. She'd never used them before.

And she wasn't afraid of thunderstorms. Her mermaid instincts got her so excited she couldn't sleep!

...This raw-meat-eating creature had kissed her with that very same mouth not long ago!!!!

Reading Guide:

1. Both are each other's first and only, HE, sweet romance.

2. Mermaid (Zhou Yin) x human (Fu Tingjin)

3. The setting is entirely made up. This is an alternate-universe story. If you drop it, please don't tell me, and don't give me writing advice.

4. Promise me you won't keep testing my intelligence, okay? QUQ

Theme: Don't let strangers into your home. It's dangerous.