While you are stuck there in place, she walks over and gets goes in her drawers. A few moments later, she comes back with a pair of her panties. They are purple with little yellow stars all over them.
You cringe as your arms take the panties, and hold them out, while your legs step into them. You begin to blush as your hands pull the garment up your legs. Once the panties get above your knees, you have to struggle to get them on.
"Come on, you can do it!" Your sister says, patronizingly.
Finally, after several more minutes, you've finished getting the humiliating garment on. It's super tight, and extremely embarrassing. Also, as much as you hate to admit it, the tight, thin, soft, stretchy material actually feels kinda good on your privates.
"Awwe," She cooes, "They wook So CUTE on you!" By now, you are blushing bright red. "They are kinda tight though, huh? They're so stretched out, I'll probably never be able to wear them again. But that's ok-they look cuter on you, anyway! Hahahah!" You sigh with embarrasment.
"Here, bend over the bed, let me see.."
A moment later, you find yourself bent humiliatingly over the bed, your panty-clad butt, stuck out for her amusement. A moment later, you cringe, as you feel a sharp slap on your butt.
"Nice ass! hahahah!" This makes you blush even more. "Ok, stand up." You do
"Now then. Next, I'm gonna...