Sister's Running Partner (Leggings TF) (Patreon)

You're transformed into your sister's leggings, and she's about to go for a sweaty, long run.

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You couldn’t even open your mouth to scream in horror at your new form.

Hearing your sister enter her room, you open your mouth to scream, but nothing happens. However, you get hit with a blast of light, and you see your gigantic sister’s face looming over you. She reaches out her hand and picks you up, your entire body unfolding as she does so. Holding you up in front of a mirror you realize in horror that you’ve been transformed into her leggings.

She must be completely unaware of this, as she tosses you on the dirty floor of her bedroom, removing her pants and displaying her curvy body in front of you. You begin begging her not to do this, even though you have no means to communicate. Her cute feet step into your leg holes, and she pulls you up, struggling to get you over her big booty and stretching you out a little bit. You feel yourself settle into your little sister’s ass crack, feeling her slap her ass. Her cheeks begin jiggling around you as she walks.

“Hey, mom! I’m going for a run!”

You begin panicking, feeling yourself stretch around her ass as she bends over to tie her shoes. You’ve seen her after her runs, how sweaty she is, not to mention the smell. She saves her daily shower for after her run.

Your sister adjusts her fitness watch and gets running. Containing her jiggly butt was a horrible experience, feeling it bounce and stretch out your body as her feet impact the ground. You were not ready for the first bead of sweat to hit you; at least you weren’t transformed into her thong.

It was a hot day and the first droplet came out of a pore on the inside of her ass cheek. You could taste it, the acrid sweat tasting like straight ass. The salty liquid settled inside your threads. The worst part was that you couldn’t swallow, or spit it out, you were forced to endure it so long as it was soaked into you. And so you did. You were nothing but your sister’s sweat absorber.

The beads of perspiration began to multiply, and each one got easier to absorb. Your body was visibly moist now, the excess gooey sweat running down the inside of your leggings form. Feeling your sister stop running, she enters the house, and you’re glad your torture is over. She had one last gift for you, and you feel her ass cheeks ripple as her asshole lets out a blast of gas, particles of the fart sticking to your moist body. Her new high protein diet was not kind to you.

“Fuck, that was good…”

She slipped you and her thong off in one motion, leaving her soaked underwear inside you. You were then tossed across the room, not even having the honor of ending up in the laundry basket. You’re left to dry, just waiting for her to do laundry again.