Prompt - https://www.derpibooru.org/1444255
Queen Novo, heavy with eggs (foal/s? who knows how seaponies work), relaxes beneath the waves.
 
Tags - SFW, Movie spoilers I guess, Entirely Reasonable Pregnancy, Not Lewd, Scenery Porn
 
Far from Equestria, beneath a great ocean that stretches many, many times farther than even a pegasus' eye can see, exists a kingdom like no other. Perhaps one day it will be known to the world, but for now it remains shrouded beneath mystery and anticipation as thick as the deep. We do not concern ourselves with that place today, strange and magical as it may be, but instead with one that seeks to leave it behind. If only for an afternoon.
 
She seeks solitude today.
 
Between tall forests of great, swaying plants and over great, studded banks of carefully managed coral, she moves through the deep with focused purpose but also an easy, practised grace. A being of ivory and fuchsia and pale blue, long and elegant as is the norm for those that dwell beneath the waves, the water parting smoothly around her glistening flanks as if it were thin air. Her midriff bulges prominently from her almost serpentine form, pear-shaped and pale, but any discomfort or hindrance it might pose is invisible to all but the most familiar. This is her realm; her element - gravidity doesn't slow her down. She passes a shipwreck - a bizarre construction sent down from the surface one day long before memory, now crawling with algae and teeming with creatures large and small.
 
A casual flick of her tail tilts her trajectory. The sea floor does the same, cresting skywards towards an island high above in a slow, easy rise. The kelp forest thins and is soon left behind, giving way to open meadows of stubborn sea-grasses that cling to whatever grounding they can find, and then a steadily increasing diversity of growth and complex life. Oyster beds nestle amongst spires of rock; algae and leafy plants of all shapes and colours, attended to by bright and bizarre fish that dart to and fro or drift lazily in thick, cloud-like shoals. The water is warmer here, nearer the surface, and it thrills her to find herself so close.
 
She seeks the sun.
 
This is the border of her realm. Some might disapprove of their queen having a retreat so far from the safety of home, and many would certainly disapprove of her visiting it alone while pregnant with an heir. Slowly, as the waters of the deep thin out and grow less cloudy, rays of light illuminate the ocean floor and all that passes above it. The plants become fatter, greener. She slows her pace, so as not to tire herself, and swarms of fish that glint like clouds of crystal glass part sluggishly to give her passage. At last she arrives at an underwater pool - twin walls of rock curling round to create a secluded bowl-shaped space beneath the sun. It isn't entirely safe here, so far from home, but it's private. Private and beautiful and warm. A place of contemplation and simple comfort that she's visited many times throughout her life. Some habits are hard to break.
 
She seeks the warmth and light, aiming her muzzle towards the source, but at last she can risk going no farther. The surface is barely out of reach, rippling softly while the afternoon sunlight soaks through. Beyond is a realm of mystery - and of adventure, perhaps, but an adventure for another time. A few gentle flicks of the fin-like hooves (or are they hoof-like fins?) that cap her forelegs let her roll onto her back, and her twin dorsal fins spread slowly like wings to stabilise her position in the water. At last she permits herself to rest, cradled from the currents and tides by her sanctuary of stone, and turns her attention to matters of comfort. Her hooves drift to her swollen middle, now bathed in nurturing light and warmth of an intensity scarcely imagined down in the depths. The glow of the daylight, even filtered through several meters of water, makes her slick, stretched hide glisten and shine a radiant, healthy ivory white.
 
With feelings of profound relief, she lets her muscles relax. The gentle water and soothing sunlight work together in harmony, drawing the stiffness and worries of the past few months away. Minutes drift by, and then an hour. One of her forelegs droops slowly from her side and hangs loosely below her, while the other slowly, tenderly caresses the surface of her laden belly. She marvels at it - the warmth, the sheen, the feelings of surprise and utter instinctive happiness that grip her heart whenever her foal makes another move.
 
She smiles, and finds contentment.