Struggling and depressed, she fell into the arms of her would be boyfriend, a badpony stallion of ill-repute who hung out with the wrong herds. As impressionable and naive Fluttershy was she inevitably submitted under his influence and followed him into an unexplored lifestyle full of thrilling vices, funded by her bank account of course. Hardcore sex, illegal drugs, and all manner of morally corrupt pleasure seeking soon had become familiar to this once sweet pure mare.
Once her funds had dried up, her boyfriend threaten to leave her unless she took upon his suggestion of finding a new line of work. And he had just the job in mind. It first started off with Fluttershy agreeing to just a few photo shoots; nothing too risque, just a few pictures of her in a bikini or her underwear. But then came the full nudity photo shoots followed by solo masturbation sessions which all lead up to the stallion’s male buddies joining in on set. It wasn’t long before Fluttershy had made a name for herself on the internet; the rumored Mane Six actress who had turned to doing porn for a living. But for her boyfriend, the greedy selfish stallion, she wasn’t making enough as an amateur porn star. He no longer was just her boyfriend, but became her pimp as well. Maybe it was her desperation for his affection or the drugs he always carried, but Fluttershy was always willing to spread her legs for anypony he brought over despite initial hesitation. This was just who she was now, a horny mare who lived for the current pleasure to the next.
I think its just the artists surreal art style being used for porn, which results in nightmares.