"Not just any mat! It's your favorite mat, but with a brand-new super-duper cover!" Brinley said, smiling and proud of herself.
"No shit?" Vanessa said, then squeezed you tighter (promoting you to let out a muffled moan as her thumb dug harder into your sensitive womanhood). "Wow, it is! This feels like some amazing quality Tinex."
"Yep, the best!" Brinley blushed, actually taking Vanessa's roundabout oblivious compliment of you as further proof that Brinley had been a genius to follow-through with this crazy plan. "I know you, like, had all those special things you loved about your old mat. You liked that it was the right tallness and fatness, or whatever."
Vanessa smirked. "Length and width, yeah."
"So, I just figured a new cover would do the trick!" Brinley nodded. "Oh, and inside the box is also Allegra's gift for you. It's a gift card to that gym-wear shop you love."
"Really? That was nice of her." Vanessa sighed. "Wished she could've been here, though. What did you say she was doing?"
"Oh, uh...family stuff." Brinley lamely replied, but Vanessa was too distracted to notice your girlfriend's weird and suspicious tone.
"Right, right." Vanessa cracked her neck. "I think I'm gonna break this bad boy in."
"Ooh, I'll watch. Then, we can finish off your big birthday bash with cake!" Brinley giggled.
Vanessa shook her head ruefully. "Sure thing, Brinley. Whatever you say."
The sculpted girl then stood up and headed into the living room, Brinley on her heels. As your girlfriend perched on the couch, the gorgeous Korean-American giantess dropped your yoga mat self onto the floor, and used her foot to shimmy you into position. She was already in her trademark sports bra and compression shorts, and was barefoot too. You could only wince in discomfort and the acknowledgment of impending suffering as Vanessa stepped onto your body, displacing her full muscular weight onto your poor self. A stray bead of sweet splashed down onto your blurred eye, and you let out a mute whimper through your mashed mouth.
And then hell began.
It was partly expected, in a way. For some insane reason, you were cosmically drawn to Vanessa's intense and sweat-soaking exercises and workouts. No matter what you did to avoid the tanned and toned beauty's exercising, fate found a way to screw you over and toss you back into her path. But you'd certainly never experienced a full-on Vanessa Ohng workout while actively being the girl's yoga mat. That was a brand-new level of hell that you'd now been forced into, and it hurt even more knowing your girlfriend was happily sitting and watching the whole thing, probably convinced you were having a blast!
Thinking you nothing more than a mat, Vanessa treated you like so, and she was merciless and unrelenting. She stomped you with her bare feet as she did jumping jacks and jogged in place. She crushed you under her sculpted firm ass when she sat down to do leaning stretches and toe-touches. She jabbed her knees into your eyes when she did some kneeling moves, and smushed and teased your crotch with her perky breasts during her push-ups. Every part of you experienced every part of her during her workout, and all the while you were drowning in the hot, stinging sweat that always poured from Vanessa's body, like the fitness goddess was a sweat fountain under that smooth skin and rippling muscle. It was miserable, and you were aching and crying for relief by the time she finished.
Of course, Vanessa was thrilled by how amazingly you performed, and you mutely whimpered as she simply rolled you up and stuffed you under the couch afterwards.
"Damn, that was an amazing yoga mat." Vanessa grinned. "I feel like I could still run a marathon. And the best part? Tinex towel's don't really need to be cleaned. Something about the absorbency of the Tinex sucks up sweat and smell, so you really only need to wash them once a month or so, if that."
"Really?" Brinley gaped. "That's so cool! Do you think I should get a Tinex cover too?"
"Don't see why not!" Vanessa shrugged. "And hell, whenever you do get a cover, you can borrow my spare yoga mat. It's currently coverless, but with some Tinex padding it'd probably do you good."
"Yay! We can be workout buddies!" Brinley bounced on the couch in excitement, provoking a laugh from her roommate.
Vanessa then went to take a shower, and afterwards the two girls watched a movie and ate cake, and then went to bed. And all the while, you suffered in silence underneath the couch, suffocating in a miasma of stale sweat and viscous stench from Vanessa's workout.
*****
The rest of the week passed in the same sort of misery for you. Vanessa used her yoga mat every single day, sometimes even twice a day, subjecting you to what felt like an endless treatment of stomping, crushing, smashing, pain, discomfort, humiliation, stench, and above all tidal waves of sweat drowning you. And of course your accursed affected genetics just sucked all that sweat up like an obedient sponge, forcing you to wallow in Vanessa's sweat and grime long after the Korean-American giantess was actually finished with each day's workout. Your suffering never ended.
In fact, it was accurate to say it got worse. Eventually, your replacement cover came, the one Brinley had intended to act as Vanessa's gift. And Brinley being Brinley, your ditzy girlfriend had already completely forgotten about you. Instead, her brain performed an elaborate mental gymnastics performance, and Brinley gaslit herself into thinking the cover was for her! Snatching up Vanessa's spare yoga mat, putting the cover on, Brinley began happily joining her roommate during workouts, and you continued to suffer in agony with seemingly no end in sight now that the only girl who knew what had happened to you had utterly forgotten!
Salvation did come eventually, two and a half weeks after being Vanessa's yoga mat. The two girls were hanging around in the mid-afternoon, Brinley lounging on the couch and Vanessa halfway through her workout. The muscular girl was in the middle of crushing you with her feet as she did jumping jacks, when Brinley suddenly shouted out.
"Wait, Allegra! Where is Allegra?!?" Brinley exclaimed, her expression horrified.
Vanessa finished up her jumping jacks, and then sighed. "Seriously, Brinley? No one's seen her in over two weeks, why did you shout like you just remembered she even existed in the first place?"
Your girlfriend blushed fiercely, and refused to answer. "U-Uh...should we start looking for her?"
"Where's the last place you saw her?" Vanessa prompted, before dropping onto the mat. Her toned booty clapped down onto your body with an audible 'squelch' of sweat and squishiness, her toned cheeks decimating your invisibly smeared face.
"I don't know." Brinley shrugged. "I guess not since when I asked her to fill in as your yoga mat cover until the actual one came in the mail."
Vanessa froze instantly. "...what the hell did you just say? My yoga mat?"
"Yeah, Allegra's filling in for...oh. Oh! That's where she is!" Brinley giggled. "Gosh, I'm such an airhead sometimes!"
"As my yoga mat? This yoga mat?" Vanessa shimmied a bit for emphasis, grinding her ass against your body.
"Yep!" Brinley nodded.
"The one I've been destroying with sweat for over two weeks?"
Brinley's smile finally faltered. "Y-Yep...?"
"Jesus Christ, Brinley."
"I'm sorry!" Your girlfriend paled, tears springing to her eyes. "I'm super sorry, Vanessa! I, like, should've told you sooner! I totally forgot to say something, and I didn't say anything at the beginning because I was, like, embarrassed you'd make fun of me! I'm sorry!"