The Waterfall (fantasy, futa on female)

My first post on FP, I thought that since my proficiency in flash has dwindled I'd resort to my other trade, writing. I use some uncommon words, and focus on enviroment and ambience more than sexual activity but here's my first piece of work. Possibly the start in a series. Please let me know what you think and whether you enjoy my writing style or if there are areas you'd like me to flesh out (obvious pun).

This series currently involves futa on female, slight themes of domination and fantasy themes.

The faint birds singing to the rhythm of the running water echoed past the lake and to anyone beyond the lake the idyllic atmosphere would be undisturbed. For those at the waterside the slapping of the waterfall upon the rocks barely masked the muffled moans only broken by the occasional unaccustomed slapping of flesh against flesh. Closer towards the cliff face and behind the waterfall in a cove, barely penetrated by the light, the sounds grew louder and unabated. Louder and louder, darker and darker, until the mystery was unveiled in penumbra. The surviving beam of sun light, frequently broken by the irregular fall of water, fell upon a wide pair of green eyes. These eyes, filled with tears and distant hope, peered towards the entrance of the cave, the escape, but the winces timed perfectly with the irregular slaps of flesh on flesh so that it became a battle to look on, fighting who? It is clear that they were not alone.An alien sound, somewhere between a pant and a hum, was now audible, and as an observer's eyes would affix to the darkness so too were the surroundings discovered. However, the owner of the green eyes would never benefit from this sight as their eyes were always towards the light. The owner of the eyes was a young woman with long hair, whether by fact or by circumstance seen to be darkish in colour, and a stuffed mouth, causing the muffle. Her hair is clasped violently, tilting her head upwards, and her back arching. Her body naked but for a few tatters of ripped clothing along her arms as they push against the floor. Her hands were not alone as her large breasts were also pressed against the cold floor, nipples squeezed against the sharp rocks, supporting her from falling entirely down. Her knees bent, pressed tightly against her abdomen, and her feet on their toes as she is pushed to be on all fours. The discomfort of her pose great, exacerbated by the cold, wet and jagged surroundings. The hand that clasped her hair seems preoccupied as it also grips a belt, feeding through the woman's mouth, and it nevertheless remains proficient at both tasks. The hand belongs to a surprisingly slender arm, seemingly bluish in hue. Following the arm, it is seen to belong to another woman with sizeable breasts and a baleful grin, growing more wicked with each strike of her other hand upon the buttocks of the first woman, the source of the peculiar slapping discovere