Girlfriends Sisters Shorts TF

Story:

I couldn't help but grin mischievously to myself as I heard Chloe and her sister Mia walk into the bedroom after their trip to the gym. My heart raced with anticipation of what was to come. You see, Chloe and I have this really kinky fetish of transforming into each other's clothing using this crazy TF app on our phones. We've been doing it for a while now, and it never fails to get us both riled up. I've become her socks, bra, panties, shirt, you name it - and she's become my underwear, socks, shirt, well you get the idea. We've even started sneaking up on each other now, transforming into each other's outfits without telling the other first, wanting to surprise them.

This time, I decided to surprise Chloe by transforming into one of her white mini shorts that she had left folded on the bed. I quickly grabbed my phone, opened up the TF app, aimed it at the tiny shorts, and whoosh - in an instant I was transformed into those exact shorts, still lying there on the bed. I kept all my senses, so I could see, feel and smell everything normally - I could even still speak as usual. The only catch was that once Chloe put me on, I wouldn't be able to speak again until she took me back off. I didn't have to wait long before I heard Mia say something to Chloe about going to change out of her sweaty gym clothes.

After a minute, Mia began stripping off her clothes right in front of me. She kicked off her sneakers first, followed by peeling down her tight leggings. I nearly choked when I saw just how skimpy and sweaty her gym thong was. They were so small that they practically were a second skin to her, and the way they rode up her ass was obscene. She had a very obvious cameltoe because the fabric of the thong covered so little of her pussy, it just rode up into her folds. I felt my cock twitch in excitement as she shimmied her feet out of the clingy leggings, finally kicking them aside. Next she reached back to unclasp her sports bra, letting her perky tits bounce free. My eyes bulged at the sight. Mia grabbed a skimpy white tank top and slid it on over her perfect breasts, the tight fabric molding to her curves.

I was so distracted by the sight of her that I didn't even realize she was reaching for me until I felt myself being lifted off the bed. "Shit!" I tried to exclaim, but no sound came out. I was too late. She was already pulling me up over her long legs, the fabric of my shorts sliding against her skin with a soft whisper.

"Fuck," I groaned silently as she wiggled me into place, my fabric molding to the shape of her pussy. The skimpy thong did little to shield me from her wet heat as she tugged me tight against her cameltoe. I had a perfect view straight up her ass crack, feeling her plump cheeks engulfing my rear. I was wedged in, face-first buried in her ass and pussy.

My mind raced, trying to make sense of the situation. Had I really just transformed into my girlfriend's sister's shorts without even realizing? What was I thinking? But it was too late now. I was trapped, unable to move or speak until she took me off again.

She tugged me snugly around her waist, the waistband settling low on her hips. I couldn't believe where I was ending up - tucked tight between her ass cheeks, pushed up against tight against her pussy through the gusset of her thong. The thong itself was so tiny that it offered little protection from her most intimate places. I could smell the musky scent of her sweat and arousal, the heat of her body enveloping me.

Worse, as she walked around the room, her thighs rubbed together with each step, stimulating her pussy and making her even wetter. The dampness began to seep through the thin fabric of her thong, soaking into my waistband. I was trapped, my face pressed against her ass crack, unable to look away as her perfect cheeks jiggled and flexed with her every movement.

From my vantage point, all I could see was her black thong stretching tight between her ass cheeks, the fabric riding up into her crack with each step. Her pussy lips peeked out around the crotch of the thong, glistening with her juices. I was basically face to face with her ass and pussy, unable to tear my eyes away (not that I could look anywhere else).

I was basically sucking my girlfriends sisters pussy and licking her ass hole, all while she is unaware.

The thong was so tiny that it barely covered anything. I watched in almost perverse fascination as her perfect pussy lips visibly throbbed, her clit pecking out from under its hood. Her arousal was evident, her wetness seeping through the thin fabric and coating the inside of my shorts.

I was getting more turned on by the second. My mind reeled at the absurdity of my situation - here I was, transformed into my girlfriend's sister's shorts, packed tight between her ass and pussy, with no way to escape or make my presence known.

She moved around, bending and stretching, her cheeks clenching around my confines. Each movement sent jolts of pleasure through my aroused body. I was nothing more than a piece of her clothing now, a accessory to her Needs. And despite myself, I was loving every second of it, the feeling of her body wrapped around me, using me for her own gratification.

Finally, after what felt like an eternity, Mia returned to the bedroom and began stripping off her clothes again to shower. I nearly wept with relief as she unceremoniously yanked me down her legs and tossed me carelessly to the side of the room with her black thong crumpled up inside me. The moment she went into the shower, I transformed back into myself. I laid there panting on the floor, my mind reeling from the wild ride I had just been on. I knew I would never look at Mia the same way again after that. And I couldn't wait to tell Chloe all about it later - she was going to be so pissed I had accidentally transformed into her sister's shorts. But damn, it was worth it. I pulled myself to my feet, grinning at the thought of all the dirty details I would share with Chloe later. This TF app never failed to deliver.