OH, I ADORE MODERN SIREN/MERMAID VIBES-- Neuvillette, curious, wanting to take her back to examine but she always remains out of his grasp, a little wary of coming to shore. He built trust, originally with the intent of being able to study her more but gradually found himself drawn to her. Neuvillette takes her into his home, keeping her in his bathtub -then pool- while bringing her things from the outside world (No legs here!!). Growing greedier, not want to share his 'research' with anyone else.

Him justifying it to himself, that others may hurt her, cut her up, or use her for their gain. Furina is too nice and trusting for that life! And he's not wrong when he finds that her tears and blood have medicinal properties--

Knowing he should set her free and tell her not to come back to shore but...struggling to completely let her go now that he's humanized her. She is no longer just a specimen, she's a friend...and perhaps--- :3c but can she, a sea creature, feel the way as

But can you also imagine all the cute scenes? Neuvillette adding wheels to his bathtub so he can roll her around his lab/house. Setting up a projector so they can have movie nights. He shows her all the things she's ever curious about. Furina's first words to him after weeks is a simple "Hello--friends?"