A/N: Everyone in the story is 18 or older.
"Come back here and get this stuff off of me!"
Emmy squirmed in her seat at the back of the minibus, straining against the heavy-duty duct tape holding her limbs in place. Not only were her wrists bound tightly behind her back, but several loops around her chest pinned her arms against her body, and more kept her ankles and knees secured together. Topping it all off, a layer of tape around her hands forced them into tight fists, keeping her from getting so much as a finger free.
"Do you hear me? You're going to regret this, I promise!"
The other five students in the forward rows ignored her, idly checking their phones or talking quietly amongst themselves. That's assuming they even were fellow students; while they looked young enough and wore the uniforms of neighboring schools, for all Emmy knew this had just been a ruse to get her on the bus in the first place. This was supposed to be special trip to the university for top performers right before graduation, and Emmy had been quite proud to find that no one else from her school had been selected. But as soon as they'd crossed out of town, the others had converged on her with rolls of duct tape and vaguely amused expressions, leaving Emmy in her current predicament. They hadn't said a word to her since.
"What could possibly be worth this, huh? Once people realize I'm missing, you're really going to be in trouble!"
Emmy wore her own school's standard uniform, consisting of a white button-up shirt with a red bow at the neck, a tan sweater vest, and a plaid pleated skirt. The others all wore blazers, despite the spring weather, probably--she realized--to conceal those rolls of tape. This had all been planned out, clearly. Even the driver had to be in on it, meaning she had no idea where they were really taking her.
"Why are you even doing this? Say something!"
Her auburn hair, tied up in a high ponytail, bobbed as she struggled harder against the tape. Emmy's muscles were tiring from the strain, but she hadn't made any progress getting free. She couldn't even reach the seatbelt, the simplicity of that additional restraint almost mocking her.
Of her captors, the most distinctive was another girl seated several rows in front of her, with dyed purple-pink ombre hair cascading down her back. She was quite beautiful, Emmy had to admit, not that it mattered now. But if Emmy was going to get through to anyone, this was somewhere to start.
"You, with the purple hair! How could you do this to another girl? Do you really know what they're planning to do with me?"
Emmy didn't really know where she was going with this, but it seemed to get a reaction. The girl leaned over to confer with one of the other students, then got up and made her way down the aisle, directly toward Emmy.
"See, we can talk about this! Just untie me and--w... what's that?"
The girl had pulled something out of her jacket: A leather strap with a red rubber ball positioned in the middle. Emmy had never seen a ball gag in person before, but its purpose quickly dawned on her.
"Wait," she pleaded, "listen to me--no--stop--"
The girl grabbed Emmy's head and began trying to force the ball into her mouth. Emmy struggled and pulled away, but with her body bound there was only so much she could do. Soon enough the girl had the edge of the ball between her teeth, forcing Emmy's mouth wider.
"Naa, uuai! Hhttop!"
"You're making way too much noise," the girl coolly responded, then shoved the ball the rest of the way in. Before Emmy could react, the girl pulled the strap tight around the back of her head, buckling it in place.