“I decided to turn you into a pair of panties.” Your sister grins at you.
“What?” You say, but you can already feel something stirring within you. You jerk as your limbs pull into your body. Your sister watches, amused, as you begin to change.
“I can’t believe you’d—” you start to say, but your lips stick together and you can only mumble your protest. Your legs stick together and your arms against your sides. You twist as much as you can but your motions are becoming stiff and limited. As you start to shrink you lose your balance and fall onto your back. Your skin feels soft and fuzzy and you can barely flop around on the ground. It feels like something is wrapping and compressing your body into a much smaller shape. The last thing you can see is your flesh changing to pink fabric. Your vision and other senses fade to a hazy blur as your head curls into a little bow.
Your sister giggles as you stop squirming, no longer able to move. As you shrink even more, your sides spread into legholes and you can feel frills spread around your edges. Your torso expands into a waistband and your bow settles into place as the changes are complete. You have become a pair of panties, lying helplessly on the floor.
“Oh.”
You fly into the air as your sister picks you up. Her massive face peers at you, worried.
“I may have made a mistake.” She holds you up to a mirror. You are white, with pink stripes and butterflies. You are much smaller than you would have expected. You try and speak to your sister but without a mouth you’ve forgotten how.
Your sister drops you and you flop to the floor. You can hear her working at the computer. “Oh, no,” she says, glancing back at you. “I just wanted to mess around and maybe wear you for the day but I accidentally sized you for a little girl. What’s more, I made the changes permanent.”
You try to get up and protest but you’re a pair of children’s panties and instead stay crumpled on the floor.
“Well.” Your sister sighs. “I can’t turn you back, but you would fit our little sister, Emily.” She taps at her chin. “There is a reality altering option. I’m sorry but I think that’s for the best.” She quickly types at the computer. You have no choice but to accept your fate as a new pair of underwear for your little sister.
As your sister confirms her entry something akin to a wave of vertigo jolts you. Your sister stands up from the computer, dazed, before shaking it off. “Huh. Deja vu,” she says. “What’s this?” The ground shakes as she approaches, picks you up, and spreads you out. “Cute. But what’s Emily’s underwear doing here? Looks clean, I’ll just put them back.” She crumples you in her hand and you can feel yourself swinging as she carries you away.
“Here we are.” Your sister holds you back up and folds you back out into your proper shape, gripping your waistband on either side between her hands. You are beginning to become more accustomed to your new panties shape. She folds you, which is a strange feeling, like being tucked together, but it is warm and pleasant. You hear your little sister’s panty drawer slide open and you are laid in your new home.
As the drawer closes and you are left in darkness with the rest of your little sister’s underwear, you start to feel drowsy. Your sister didn’t recognize you except as any other pair of panties. Was that it, then? Were you erased, confined to a new existence as a little girl’s undergarments? You’re not sure how much time passes, until the drawer is pulled open and the little hand of your new owner reaches in to grab one of your kind. She pulls out a pair of blue panties with rainbows before shutting you in darkness once more.
The next day, the hand retrieves you and Emily pulls you out. She is standing naked in her room, her hair still damp from her shower. She spreads you by your waistband and slides you on one foot at a time. As she shimmies you up her legs you slide into place. She adjusts you until you are snug. A perfect fit. Emily covers you with a skirt, finishes dressing, and prepares for school.
As she goes about her day, you can feel her legs shuffling against your cotton body while she moves. While sitting at her chair her thighs brush against you, pushing you into her crotch, and you realize she needs to use the restroom. After obtaining permission from her teacher, she hurries to the toilet and slides you down. You can hear herself relieve herself before she hops forward and pulls you up. You feel a slight dampness over your cotton body. That is part of your purpose, though.
As Emily returns to class and you consider this, the memories of your change start to blur with memories of yourself being thread together. You are sewn, assembled, and packaged along with other panties. That is the reality of your origin, is it not? Emily reaches down to scratch, adjusting you, and as she does you cannot remember anything else. You were made to be a pair of panties for a little girl, and your mind fades into complacency with this fact.