"My God, this itch is bad", you manage to hear Bethany say while she goes in for yet another aggressive scratch through her underwear. Without giving it much thought, the girl walks out to the hall and goes to class. You can tell when she sits down because not only are you deep inside her butt cheeks, but now they're compressing you like nothing ever has before. Her sitting down on you as you crushed from every angle imaginable, and the itching powder isn't making the experience any easier. Her itch still hasn't gone away, but to avoid being seen by her classmates, she just discretely grinds her chair back and forth, side to side, hoping her panties will rub against her itchy parts and relieve her.
This, of course, was very discrete to the whole classroom, and nobody noticed Bethany's predicament. Nobody, except for her panties, of course. This was not what you had imagined a day in Bethany's ass would be like. This was hell. The intense sour smell of her sphincter while you're being forcefully rubbed against it, the constant friction creating heat, the sweat starting to form on the inner walls of your wearer's cheeks, were all combining to make your morning as miserable as it could possibly be for a girl's underwear.
After what felt like ages getting close and personal with the inside of this giant girl's rear, you felel her get up and quickly walk somewhere. Then, you hear her abruptly shut the door behind her and you feel her leggings coming off. It looks like you're coming off shortly after. You feel her grab you by the waistband and start pulling down, and while the rest of your body is almost completely below her butt at one point, your face was so deep inside her crack that you feel the grip of her ass resist taking you off. You'd been plunged so deep into her that she actually had to pull a little harder to get your face out of the crevice.
After you're peeled off of her, you can once again see her beautiful (yet confused) faced as she steps out of your holes and grabs you to inspect you. She quickly scans your face searching for something, and shortly after doing so she finds the itching powder remnants on the back of her underwear. "No wonder I was itching like crazy! Damn you, Robin, I know this was you" you hear her mutter. She isn't speaking too loud but you can tell it's becasue she's in the girl's bathroom and anyone could walk in any second.
Bethany puts you down on the closed toilet lid and, still half naked, starts rummaging through her backpack. She soon pulls out some wet wipes and starts wiping the inside and outside of her butt thoroughly but carefully. The way she wipes herself with such a delicate touch, compared to how harshly she had forcefuly rubbed you against her anus before that, made you a little jealous of the wet wipes, if that made any sense. But the fact that at least she's keeping you and throwing the used wipes away comforts you to some extent. Shortly after taking care of her skin, Bethany grabs you with 2 fingers, opens the toilet lid and gives you a couple of flicks in the back of the head, in an attempt to drop the remaining powder into the toilet bowl. Then, she gives you a pretty stern shake and bundles you up into a small ball. You feel how you're thrown into a pocket in her backpack and you hear her getting dressed again and leaving the bathrooms with you still in her bag.
While you're in her bag, you start to get bored. Have you had enough of being Bethany's panties? It seems like she's done with you for the day and would rather go commando. Or maybe you'll stay as panties for a while more, and see what happens?