"Alright Jeff I've decided you're going to be my underwear!" Sarah proclaimed excitedly. Jeff's little eyes went wide with terror at Sarah's declaration. "Wait, Sarah can't I be something else?" she begged. Sarah who at this point had made her way to the PC in her room looked down at Jeff and crossed her arms "Well it's either that or my shit, what's it going to be?" Jeff looked down dejectedly as she considered her options; in truth it wasn't that difficult a choice to make. "I-I'd rather be your underwear" she squeaked out. Sarah smirked in response. "In that case beg me for it." Jeff looked up shocked at her command. "N-no way I'm doing-" Sarah interrupted. "My shit it is then let's go introduce you to the family." Not wanting to test her Jeff immediately changed her tune. "Wait no Sarah please, please let me be your panties, I'll do anything you ask, just let me be your underwear." Amused at how easily she had her former older brother wrapped around her finger Sarah relented. "Well if you really want to, I guess I can let you be my panties."
As she mocked the depressed little turd Sarah started up the Chronivac program "hmm, lets see what we have to work with '' Jeff looked on in terror as Sarah casually scrolled through the options deciding his fate. "Material? cotton, I need you to be comfy. Size? Nine. Cut? Let's go with Bikini can't go wrong with a classic. Color? definitely pink, oh but I could give you a pattern, how do you feel about hearts?" "Um, I don't really-" "Okay floral print then, Let's see about the extra features." Jeff curled up in a ball as her sister/owner continued to play with her fate. "I could make it so you never stain, but I kinda want to see that cute little face of yours covered in a skid-mark." Jeff just buried her face in her arms as she tried to block out Sarah's taunts. "I could also make it so my farts, piss, and shit all taste and smell like candy to you, but where's the fun in that? Nope I'd rather you have to just get used to them all on your own. I will make it so you never wear out though, and I think that's it." Sarah declared as she hit the enter button and suddenly Jeff's world went completely black.
Jeff woke up on Sarah's bed to the sight of Sarah's evil grin looking down at him; startled she immediately jumped back. "Aww, is the little panty-girl scared, here why don't you get a good look at yourself." Sarah placed a compact mirror the size of a flat screen to Jeff in front of her. To her surprise she looked like a human girl covered from head to toe in a floral tattoo but her skin seemed to be otherwise human: her face the only bare part she guessed representing the gusset. Besides that there was a bow permanently tied around her neck like a collar, a tag stuck to her back and a pair of frilly lace bracelets and matching anklets attached to her limbs. She did note her form seemed to be a more human and yet also panty version of her previous fecal one; with the hair style and body dimensions matching just with far less shit.
"So what do you think?" Sarah's voice boomed down to her. "Well I guess it's an improvement." She admitted. "I just wish I wasn't so girly." Sarah laughed as she patted Jeff's head with her index finger. "You're panties silly, you're going to be girly. Now that's enough admiring yourself, we've got to get you introduced to the family." Sarah stood up to reveal she had stripped off her pants and underwear while Jeff had been enamored with her reflection. Immediately realizing what she had in mind Jeff sprinted to the other side of the bed only to be plucked from the bed with ease by Sarah who brought her to her face to scold her. "Bad girl! you don't run from your owner, try that again and I'll run a marathon in you understand?" Jeff shuttered at the thought knowing Sarah was fully capable of that and quickly started nodding her head in assent. "Good now, let me get you on."
Sarah pulled on Jeff's tag and she immediately went limp as her body unfurled into its proper Panty form. She then lowered her former older brother to the floor; scared Jeff suddenly spoke up "Sarah this is happening a little too fast can't we wait a little-" "No Jeff, this is happening, just give up and accept it." Sarah then quickly pulled her up so she fit snugly around her ass, cock, and balls. "Mmph!" Terrified Jeff tried to scream out but all of her protests were muffled by Sarah's enormous ass, and only served to make her giggle. "Jeff! no talking while being worn it tickles and I can't understand you anyway." She smacked her ass as punishment the pain reverberating through Jeff's core and instantly shutting her up. Sarah then made her way to the full length mirror in her room to check out her new panties.
Sarah posed a few times admiring the way Jeff perfectly hugged her toned ass and cradled her massive package, and satisfied she gave Jeff an approving pat. "Wow Jeff, you know being my shit was funny, but I really think this is your true calling in life. I mean do you know how hard it is to find panties that are both cute and can handle my dick? and you do both so effortlessly, it's like fate." Jeff wanted to cry at the mention of her dick she was currently being forced to taste; a faint sour taste of sweat mixed with a hint of Sarah's body wash. The taste of her cock was of course better than her asshole which seemed to be where all of her senses were concentrated; upon it Jeff could see, taste, and smell the intensely bitter flecks of shit from the bowel movement she had previously been a part of. The light that was filtering through her fabric was suddenly cut off as Sarah donned a robe and made her way out of the room. "Well Jeff, it's time for a family reunion"