Prawns

For her two hundredth birthday, Syrine threw herself a mermaid party.
The surgical alteration tanks grafted on the fish tails and gills with precision, nanobots coursing through their bloodstreams.
For hours, she and her friends swam in the orbital colony’s water basin, circling and playing.
They returned to her home and had themselves changed back in time for the dinner celebration.
Mermaids. Centaurs. Winged angels.
Although the angel configurations couldn’t actually fly, even with low gravity zone assistance.
Swimming was flying through water, wasn’t it?
She flexed a prawn’s tail in her fingers, twisted it, and took a bite.
Delicious.