This is such a romantic question Chich wahh...

The first thing Deepcolor finds beautiful about Cetus is his smile. It's such a uniquely human expression of joy. Seaborn don't really smile. When they bare their teeth, it's a show of aggression. Her evolutionary history tells her that she should logically feel threatened by the gesture, but for some reason she can't fully explain, it just takes her breath away. She likes it. She draws it in her sketchbook, remembering it and wondering why it made her feel so light. Why it made her heart race. Why she yearns to see it again. And again. Why she feels proud to know she caused it. Even before he calls off his hunt, even when she knows he's a danger to her. She likes seeing him smile. She practices her own smile in the mirror some mornings, since facial expressions are a new type of ability that comes with a human body, and as she stares back at her reflection, Deepcolor wonders if Cetus likes her smile, too.

The first thing Cetus thinks when he sees Deepcolor is that she's beautiful. He can't help it - he's appreciative of aesthetics and his first impulse thought when finally seeing this mysterious Deepcolor person is that she's attractive. But of course he would - that's part of the advantage of her carefully crafted human body. Cetus dismisses the thought as quickly as he has it, because her physical beauty means nothing to him if a monster lurks underneath.

It's not until that fateful night on the beach when he's finally come to end her time at Rhodes Island, and Deepcolor mourns, weeps for the end of all she's come to know, for the futures she'll never have, for the things and faces she'll miss, does Cetus understand. She is beautiful. She's a beautiful seaborn. One that loves every moment of being alive.

He knows he can't hurt her then. Or allow anyone else to.