While you're admiring the huge, sweaty beauty next you you, you notice her sky blue running shorts have slipped nearly halfway down her titanic asscheeks. The twin mountains of jiggly pale flesh are separated by a deep crack where a river of sweat is pouring into, a crack that looks just big enough for you to slip into. You can't pass this opportunity up.
"Huff... Huff..." The woman pants, attempting to wipe the sweat from her brow with an equally sweaty forearm. With her arm still raised she leans into her sweaty pit and takes a whiff, an annoyed look immediately showing on her face. "Well, so much for that 'triple extra strength' deodorant," she complains to nobody in particular. Even from where you're standing you can tell what she means, her armpit stink is stronger than most others you've experienced. But you're here for a different odor, so you sneak behind her to get a better look at her booty.
From the side her butt already looked huge, but from the back it takes up almost you entire view. You can faintly see steam rising up from between her cheeks where her sweat is meeting with the incredible amount of heat trapped under her nether regions. The unmistakable stench of swamp ass wafts out with it, mixed with the smell of an all around unclean behind. The alluring sight of her gigantic butt combined with this pungent yet intoxicating stench are too much to resist.
Being as quiet as possible you tip toe up behind the sweaty giant and climb up the back of the bench, carefully slipping your legs into her exposed butt crack one at a time. You can immediately feel the heat rising up at you while you're above the opening, and her sweat makes it easy to slip in as it soaks into your clothes. You dick is rock hard as you descend into her sweat soaked shorts entirely, resting in the seat of her pants, the heat between her cheeks comparable to a sauna. The stink of her filthy, sweaty ass is now the only air you're breathing, so much so that you can practically taste it. This is truly heaven.
As your eyes adjust to the darkness a bit more you get a better look at the ass you're dealing with. It's huge, of course, but now that you're up close you can also see that, first of all, she isn't wearing any underwear. Second of all, all along her crack, in contrast to her pale cheeks, is stained brown with unwiped shit stains. This girl really doesn't wash at all. Third of all, lodged inside her big, puffy, chocolate donut of an asshole is an equally massive pink buttplug. She's dirty in more ways than one.
Suddenly things start shifting as the massive woman stands up and pulls her pants back up, pinning you directly against her ass and taint. However, probably used to the feeling of something jammed up her ass she doesn't notice you.
"Alright, come on Pauline, one more mile," you hear her telling herself. As Pauline resumes her jog you're treated to a very smelly, very sweaty full body massage as her butt cheeks grind against you with every bounding step she takes. You're bounced around in the dark with an absolute waterfall of perspiration drenching you without end, and you happily open your mouth to drink from the salty river.
As the jog goes on you decide to get even more daring and get a taste of her luscious asshole, figuring one little lick couldn't feel much different from a drop of sweat to her. As your tongue runs across her wrinkled sphincter your taste buds explode with the bitter, salty flavor, begging you for more. You immediately start licking all around the big pink plug to taste her filthy crack, in love with her chocolate starfish.
"Oh no, is it falling out already?" You hear Pauline say worriedly. Suddenly a huge finger pushes right up against the back of your head though the pants fabric, mashing your face against her asshole while also pushing her butt plug in further. "Oh come on, not yet. I just have to get home!" Pauline picks up the pace a little, and you start to wonder why she's so concerned about her plug staying in. Given how smelly this girl is from the outside, you're dying to know what kind of stink she's got bottled up on the inside. Maybe her plug could "accidentally" fall out before she gets home?