>>2687651She walks out of the bathroom and goes to class and over the day several people notice her lack of panties (to make her less reactive and more careless, maybe make her a girl who normally wears shorts or spats under her skirt?)
Possible follow-up: school has a co-ed changing room for gym class where they're unashamed to strip to their underwear in front of each other. She drops her skirt first, not realizing there's nothing underneath. She begins to attract stares as people notice while she obliviously takes off her shirt.
If it's a sailor-style uniform, it would make sense for her not to notice as she pulls it over her head and her breasts fall out into the open. If it's a button-up, she could be too busy staring at the boy (or girl) she likes in their underwear to look down while unbuttoning it and slipping her arms out of the sleeves. She smiles because her crush is looking back at her. Or maybe she's looking at a big-chested girl and wishing she had breasts people would look at.
She drops her shirt to the ground and glances down to get her gym clothes. Hopefully by this point some enterprising young men will have stolen them, and if we're lucky they'll have grabbed her uniform, too. She finally realizes she's naked.
Who knows where it goes from here? Maybe she panics and teleports home (boring). Maybe she tries to teleport home, but in a panicked "oh God I hope I don't end up in a crowded public space" she accidentally pictures herself in a crowded public space. Maybe she successfully teleports home, but before succeeding keeps looking and thinking about classmates and accidentally teleports them (with or without their clothing and underwear) into her room first.
Maybe she forgets she can teleport in the heat of the moment.
Best case scenario? She freaks out trying to teleport home and keeps teleporting all of her female classmates' clothing away instead.
(pics tangentially related)