In the distance, you hear something break the surface. You look around, and at first in the darkness you see nothing. But as you look closer, the moonlight reveals something moving in the water maybe 20 metres away. A pink fin cuts through the water, making its way to shore. "What kind of fish is that..?" You think to yourself as you look on. You soon get an answer.
The fin stops in the shallow water, and the fish breaks the surface. This was, however, no fish. It was... a person! A woman by the looks of it. Long brown hair clinging to her back, with an athletically toned ass and large D cup tits, heaving up and down as she breathed. She waded to shore, and that's when it dawned on you. This woman wasn't entirely human...
As she looked around, you noticed that on the side of her head, a pair of pink fins replaced what would've been normal ears. Under her tits, 3 parallel slits open and closed as she breathed. Gills..? Her hands and feet shone in the pale moonlight, a pink webbing in between her digits, and a smattering of scales adorning both her flipper like feet and webbed hands. The dorsal fin on her back fanned out like a sail, as well as other fins on her hips. Then, her eyes turn toward the water, and you can see her face clearly.
It's Brooklyn, your girlfriend! Her blue eyes shone in the moonlight like stars, and scales smattered around her hairline and by her finned ears glittered like her highlighter. You made sure to be completely still, sinking slowly into the water. She turned back to the beach, and walked up onto a rock, where she sat. She wrung her wet hair with her webbed hands. Your girlfriend... is a fish woman!