Art is by Punopupupu: https://twitter.com/punopupupu/status/1389036067878096896
Caption text:
Rob screamed. He screamed harder than he ever had in his life, yet not a sound was made. He was muffled completely, his face squished between two fat mounds and his mouth stretched over a fetid ring which suffocated him with a rancid aroma.
“I want you so bad, baby, please give it to me!” Rob heard the muffled voice of his girlfriend, Lexi, from above. She was a total goddess lucky enough to settle with him a few months ago, a sultry seductress whom Rob was infatuated with. With pink eyes and hair, her face held a hypnotizing beauty, and while her breasts were merely average, her ass was thick enough to drive any man wild. Her lustful whispers, however, where not aimed at the Rob stuck between meaty boulders.
“You’re really horny, aren’t you? Very well then, bend over to show me that gorgeous ass!” A male voice responded to the woman. Despite what it would seem, Rob was not being cheated on, nor did he have a bizarre fetish fulfilled by standing over a sexual act. As far Lexi knew, she was only having some quality time with her hunk of a boyfriend and partaking in dirty talk during foreplay.
Doing as she was told, the woman raised her rear and swung Rob around. Once he settled down, he came across a petrifying sight. Standing above him and with a lecherous gaze was a giant of a man; himself. He greedily dug into the fat ass before him, shifting the boulders keeping Rob hostage and edging his mouth closer to the puckered ring. Now focused on his lover’s thong, the man fiddled with the underwear’s straps, making Rob wince as his limbs were toyed with.
The man truly was obsessed with his girlfriend’s ass. It wasn’t enough for him to grope and fuck it, he wished for those fat cheeks to take over his entire world. Looking through a dusty tome, he had found a spell that could place his mind inside inanimate objects, the man’s goal being one of the thongs Lexi often slept in. The plan was for him to spend a few hours between her cheeks at nighttime, a plan that seemed to go perfectly as Rob found himself in heaven beneath the bed sheets. The taste of sweat was a bit rough, but the pleasant stretch around the woman’s hips more than made up for it.
However, something went terribly wrong in the morning. Rather than awaken in his human body, Rob remained stuck on his lover’s bottom even as she woke up and started her day. Confusion turned to pure terror once Rob found his body roaming around the bedroom. He looked confused and dazed, though some clarity came to his eyes as Lexi kissed him deeply.
Before the thong could figure out what had happened, his wearer sat down in bed, smothering any concentration out of his mind and pulling his mouth taut against her rank anus. From then on, all Rob could hear were the muffled sounds of the morning makeout his partner often relished in. After torturous minutes, the woman stood up, gifting Rob with a final perplexing look at himself before a pair of jeans was placed over him. Before darkness enshrouded him, Rob could have sworn his body had looked at him with in glee.
Taken along through his girlfriend’s daily routine, the thong was subject to utter torture around her hips. What he had envisioned as a few hours of pleasure around his lover turned into an inescapable torment as every step shuffled his body deeper into her ass, wedging his strings into her folds where they would soak in the woman’s natural funk. Worse than walking around was whenever Lexi would sit down, which meant a crushing pressure threatening to break Rob’s sanity.
All the while he suffered beneath the woman he obsessed over; Rob’s old body gained his bearings back at home. It had come as a shock for the thong to suddenly possess a human body, but he could not complain at all. Moving felt amazing, and the fresh air flooding his lungs was glorious compared to the rancid swamp which formed at his former-owner’s crotch. Above all else, the new Rob became aware of his body’s intense libido. Just thinking of his girlfriend was enough to create a raging boner, and rather than remember those grueling hours as mere floss between her cheeks, the man’s thoughts were only focused on the ass’ alluring jiggle and how badly he wished to grope it.
Come Lexi’s return from work, all his desires were met. After treating his hands to a fat ass, Rob twiddled with his girlfriend’s thong, giving only a fleeting thought at the new resident of the underwear’s form. Pulling aside a string, he plunged deep into Lexi’s pussy, pounding instinctually as to make her moan louder than she ever had before. It took little time for Rob to experience the first of many orgasms in his body, and by the end to the night, he wished for nothing more than to endlessly fuck his woman for all time.
Lexi lay in deep sleep after her ravaging, all the while her man sat beside her in deep thought. He pulled the cum-drenched thong over her thighs, dangling the flimsy cloth in his hands. “Hey, man, I really gotta thank you for this swap! I’m not really sure what you saw in getting stuck around that babe’s ass, but I won’t judge. I found some spell book laying around with a reversal spell, but since we’re both really enjoying out new spots, I think I oughta just burn the thing!”
The thong internally screamed, begging his old body for mercy. Were it able to talk, it might even be willing to make a deal where the two would regularly swap between forms. Anything would be acceptable for the thong, anything besides a lifetime of its owner’s sweaty ass. Yet his pleas went unheard, not that it would bring much help if they were heard. To no one but itself, the thong screamed louder as it approached what used to be its erect penis. “Since you live to serve my girl, that also means you should serve me, right? Well, I’m still very horny, but I don’t wanna wake her up, so I guess you will have to do for the rest of the night!” Rob laughed, wrapping his former body around his length as he began to stroke.