"Awesome" she shouts and grabs some clear panties out of the box. It seems to be made of plastic, but you're not sure what she's up to. You're about to ask what it's for, but only a faint sound exits your lips, because Christine immediatly grabs your tiny body. She quickly walks to her mother's bedroom, where the ironer stands. She drops her brother on her mothers bed and grabs her scrunchy. She ties her brother in it, and drops him next to her new panty. She ways teasingly and says she'll be right back.
Unable to move, you can only watch your sister getting the ironer ready. It takes some time, so you try to look at her new panties. It is a thong, and indeed made out of plastic. You cannot make more of it, but you cringe, knowing you'll soon find out. After a minute of uncertainty your sisters face comes back in view, looking very excited. "Guess what Allen, I've found you a new little use for you. Christine picks you up, and you see her other hand grabbing her panties. She walks over to the ironer and drops you on the surface below. Her face looms closer and she holds her panties in front of you.
She strokes her thong and explains her plan "I've found this amazing website where they sell clear panties" she smiles, "You can buy all sorts of decorations, which you can put in between the plastic". She pinches two sides of her panties and hold them apart. "See, you can put all kind of things in it" You know where this is going, and you start struggling in her crunchy, but it's no use. Your sister laughs at your struggles and continues her story. "When you are satisfied of your handywork, you can simply iron the plastic together, creating your own personalised panties".
You plead with your sister to stop, but she just grabs your body. "Please Christine, I'll do anything you want, please don't make your panty decoration!". She pouts a bit, "Sorry Allen, but there's nothing I want to do more then ironing you inside my underwear!". "Now, where do you want te be?", "You'll make a cute figure in the front, wouldn't you think?" She turns her thong around and strokes the thin part. "Or maybe you want to be deeply buried between your sisters buttcheeks, pressed right against my cute little hole".
She smiles widely "your choice".