“Uh… aren’t those for dogs?”

“N-no, it’s an advanced therapy tool!”

“It looks like a collar.”

“W-well… ok, it does look like that, but…”

Jenna Murayama peeked around the corner at the two dweebs, pulling out her phone and stuffing her earbuds into her pocket. She had been on her way back to class from a bathroom break she had taken to touch up her makeup when she had heard them talking, nasally voices echoing in the empty corridors of Vihdale Central College. It was an early winter morning in February, still a pre-dawn grey outside, but the building was warm, the kind of harsh, artificial warmth of heaters working overtime to beat back the cold. There weren’t many classes on; the two nerds and their eavesdropper had this part of the building to themselves. On the left was Helen, a straight-laced straight-A student who Jenna had swirlied more times than she could count. Unfortunately, on none of those occasions had Helen given much of an entertaining reaction. The girl’s attitude was as dull as her square glasses, bob haircut, and carefully blank expression indicated. In bullying terms, she was the boring one. Of real interest was Lily, the girl on the right, long messy black hair dishevelled and chubby frame obscured by a hoodie featuring some anime character Jenna was too cool to have ever heard of. Lily was… yep, clutching what looked like a dog collar, fidgeting anxiously as usual. Jenna had no idea what was going on, but she smelled an opportunity for mischief and blackmail. Two weird, horny nerds putting collars on each other in the college’s corridor would be a goldmine. They’d be doing her homework for the rest of the semester!

“So are you seriously gonna wear that thing?” Helen asked, raising an eyebrow.

“W-well, not now, obviously…” Lily replied. Damn. Jenna tucked her phone into her pocket, disappointed that she wouldn’t be able to film anything incriminating.

“But t-tonight, I’m gonna use it to fix my problem with like, making eye contact and stuff,” Lily continued, holding the collar up for Helen to see. Jenna had to suppress a giggle at that. Lily was an anxious mess, there was no way that she’d be able to fix her complete inability to make eye contact with gorgeous, intimidating girls (like Jenna herself, obviously). Besides…

“How does a collar help you with that?” Helen asked, echoing Jenna’s own thoughts.

“Because it’s a… conditioning device.”

“Meaning…?”

“Meaning it… y’know… trains you to have good habits. By uh. Shocking you and stuff.”

“It what?” Helen sounded affronted, and Jenna was appalled too. She couldn’t believe she hadn’t filmed that! The collar was even more obviously a fetish thing than she’d thought!

“W-well, not just shock! It gives you a like, pleasant jolt when you do good, and a shock when you do bad… look, I just link it to my phone, and I can adjust the levels, I’ve already calibrated it… a-and if I connect it to the camera in my laptop, it can hook up to the eye tracking and like, train me to make eye contact with stuff, and, y’know… discourage me from looking at other areas…”

That was something Lily could really use. Jenna had lost track of the number of times she’d caught the pathetic little nerd staring at her chest. Not that she could blame her, of course; Jenna stretched languidly, catching her own reflection in one of the windows in the hallway. She flicked her long, silky platinum blonde ponytail, and gave herself a smirk. It was no wonder Lily found her irresistible, especially since Jenna’s white halter top did a spectacularly bad job of containing her… assets, generously proportioned F-cup tits that she knew for a fact that Lily must have jerked off to while thinking about, there was no way that horny dweeb hadn’t fantasised about smacking them around and splattering them with…

Jenna snapped out of it. Ugh. Her mind always went to that kind of place when she was thinking about Lily. It must have been because Lily was such a perv! That girl was obsessed with her… it was honestly kind of cute though, the fact that Lily was such a loser that she had an obvious crush on Jenna, despite all the bullying. Jenna found it endearing.

“… a-and when I’m done, and I’m able to talk to her properly, I wanna ask Olivia to be my Valentine…”

Jenna whirled, almost tripping in her heels and blowing her cover as she looked back around at Lily, aghast. Lily was seriously going to ask that pretentious goth bitch out?

“You’re going to ask her? She’s one thousand percent out of your league,” Helen teased. Lily shifted shyly. She had that cute look on her face she got when she was a little embarrassed, flushed cheeks and a twitchy, nervous little smile, it was so adorable…

“I-I’ve been talking to her a lot lately, I’ve been tutoring her in Applied Statistics. She’s actually really sweet, even if she seems a little cold on the outside…” Lily said. God, why did her little stammer have to sound so sweet… anyway. This was unacceptable. Obviously Olivia was just exploiting Lily! Pretending to be nice to her to get help with her homework or whatever, and Jenna’s poor, innocent little loser had fallen for it so badly she was actually going to ask that vindictive whore out…

“Besides, who else am I going to ask? The only o-other available girl I talk to regularly is Jenna, and somehow I don’t think asking out a bully like her would be a good idea,” Lily laughed, and Helen joined in. Jenna’s cheeks burned. OK, maybe Lily wasn’t that poor and innocent. Jenna would have to teach her a lesson. Who did this fucking loser think she was? She waited a few seconds for the laughter to die down, then stepped into full view of the girls.

“Oh! I thought I heard a pair of total nerds down here, no wonder it’s you two!” she strode towards the pair, hands on her hips, chest thrust out, eyes locked straight on Lily, who had turned white as a sheet, expression suddenly anxious.

“A-ah! Jenna! Hi! Um… y-you didn’t hear any of that, right?”

“Hmph!” Jenna squared up to Lily. She was significantly taller than Lily, sitting at just under six feet tall, even without the four inches added by her open-toed heels. Her denim short shorts showed off every inch of her long, smooth legs, another part of her that she often caught Lily ogling (and in fact, was catching her ogling right now).

“Why would I bother listening to what you two are talking about? It’s probably just some boring nerd stuff, like Craft of Warworld, or Fourteen Final Fantasies,” Jenna scoffed, waving a hand dismissively. Jenna had actually listened to Lily babble on about the games to Helen enough that she knew the titles perfectly well, but she refused to admit that.

“R-right… well, we really should be going-” Lily tried to shuffle away (and to tear her eyes away from Jenna’s legs), and Jenna stepped closer without missing a beat, her heart racing. This must have been how lions felt when cornering their prey; Lily was just such a perfect victim, Jenna couldn’t resist winding her up.

“Oh? What’s that?” Jenna asked innocently, pointing at the collar in Lily’s hand. Lily made a strangled eep sound, and tried to hide it behind her back. Jenna smirked as Lily’s nerves started to kick in. The girl really needed that conditioning, Lily was staring at the floor, obviously incapable of making eye contact. God, she was so pathetic like this…

“I-it’s n-nothing… just um, a cool wristband!”

“Oooh, can I seeeee?” Jenna cooed, pressing her arms together, and had to really try not to bite her lip at the sharp, ragged intake of breath as Lily glanced up, only to find herself staring at her bully’s tits squishing together through Jenna’s thin halter top. She knew for a fact that something was stirring in Lily’s sweatpants right now…~

“U-um… well, like I said, we have to go to… um…” Lily glanced away from Jenna, presumably looking to Helen for help.

“O-oh, that’s right we have that… elective, right now!” the other girl piped up lamely.

“S-so, sorry Jenna, I just don’t have time to chat right now!” Lily moved with surprising deftness, sliding out from between Jenna and the lockers, opening her own locker, and throwing the collar into it in only a few seconds. Lily closed the locker, spun the dial, and then dashed off, with Helen in tow.

“N-nice talking to you Jenna!” she lied. Jenna rolled her eyes, but didn’t pursue. Glancing at the clock up on the wall, she realised she needed to get back to class anyway. She flicked open her phone to reconnect her earbuds.

“Huh… what’s this?”

Underneath the listing for her earbuds, there was another device nearby, with an open connection. ‘Conditioner EC-06’... what, an air conditioner or something? That’s weird, why would that-

Jenna blinked. No way. It couldn’t possibly be…

She tapped on it. It was.

Lily had been in such a hurry to stuff the collar back in her locker that she hadn’t deactivated it. The connection was still open, and now a complete control panel had opened on Jenna’s phone. Jenna glanced around the empty corridor, checking that Lily wasn’t going to return, then back to her phone. You could change the shock voltage, with a sliding scale from one to ten (Lily had the painful one set to a three, and the pleasant one set to a four), add verbal commands, and even configure the…

“Ha… hahaha… oh my god, yes…” Jenna giggled to herself. The app had a stock photo of an attractive woman, and invited the user to specify which parts they wanted to train themselves to look at, and away from. Lily had highlighted her eyes in blue, and her generously proportioned chest in red. Jenna knew what she had to do. This would be such a funny prank!

Snickering, Jenna swapped the highlights around, so that the woman’s eyes were marked as a shock zone, and her chest was the opposite. That would show Lily! She’d get a few nasty zaps before she figured out what was happening. Just imagining Lily getting repeatedly shocked, whimpering as she tried her hardest to look those girls in the eye… Jenna rubbed her thighs together, almost unconsciously. She swiped out of the eye tracking configuration, and was about to close the app and go back to class when something else caught her attention.

“Safeword function… enabled?”

Huh. Now that sounded kinky. Curious, Jenna opened it… and her heart skipped a beat as she read the little text explainer.

‘Your ErosCorp Conditioner Collar Model 06 can be set up to disable itself and unlock its catch only when the pre-recorded safeword is spoken.’

Phew. Had someone turned the heating up? Jenna realised her halter top was sticking to her now, sweat beading as she fanned her own face… which was burning red now.

Below the little text explainer for the safeword, there were two buttons; rerecord, and playback. Jenna tapped the playback button.

“Olivia…”

Jenna’s eye twitched, and for a second she wanted to throw her phone out of the third-floor window opposite her. Lily sounded so dreamy while she was saying that slut’s name… Jenna’s eye caught on the ‘rerecord’ button, and for a moment, a truly wicked impulse crossed her mind. No, she couldn’t-

Jenna paused. She thought about how Lily had said Olivia’s name again. On second thought, yes she could. Jenna tapped the button, and held her phone close to her plump, pink lips, her gloss smacking gently as she quietly purred, “You’re mine, loser~”

Wait… why had she said that? Jenna hadn’t even thought about it, that had just come out of her. Maybe she should retake it, that sounded almost like… like she was jealous that Lily was into another girl. No, it was nothing like that, it was just because a loser like Lily belonged to an alpha bitch like Jenna, that was it…

Jenna ended the recording, and a popup appeared.

‘Warning: this change cannot be reversed. Please confirm the new safeword.’

Heart thundering in her chest, Jenna paused. Was she maybe taking this a little far? Fucking around with the safeword on Lily’s collar could be really dangerous… what if Lily couldn’t take it off? What if she was left writhing on the floor, whining and whimpering while she was shocked again and again, making all kinds of pathetic little noises…

Jenna’s breathing was becoming ragged, and her hand shook a little as she jabbed the ‘confirm’ button. There was no taking it back now; the old safeword was erased, and unless Lily thought to check it, she’d have no idea something had been changed.

Jenna swiped out of the safeword settings. She really needed to stop messing with this thing, and get back to class… but before she could, Jenna's eye caught on the shock intensity sliders. That was it! She’d dial those down a little, to make sure this prank didn’t cross into actually, really hurting Lily, it’s not like she’d ever want to do something that hurt her…

Still, holding down the slider for the painful shocks, Jenna couldn’t resist sliding it up a little. Just for fun. She’d put it back down eventually-

‘WARNING: Setting 7 and higher may impair mobility and impact ability to remove collar. ONLY employ setting 7 and above when under the supervision of a trusted person, or with a correctly calibrated safeword.’

Jenna’s hand started to shake again. Her heart thundered in her ears. A line of drool ran down her chin. She was imagining Lily… totally helpless… lying on the floor, whimpering as she was shocked again and again for hours, whining out to Olivia for help, and getting no answer… and not just that, but the way Lily’s adorable, scratchy voice would sound when she was moaning, overwhelmed by waves of pleasure from the collar’s other functions while she gawked at girls’ chests, a cute little tent popping up in her pants as she was trained to act like a weak, anxious loser around any attractive woman she met… experimentally, Jenna pushed the positive shock setting up to level seven as well. The same message popped up. Having them both this high could basically immobilise Lily…

Slowly, without even thinking about it, Jenna’s free left hand slid down her belly. She couldn’t… couldn’t do this… it wasn’t just about what would happen to Lily tonight, this could permanently alter the poor girl’s mind… it wasn’t right, sabotaging her efforts to improve herself, right?

But I like her better as a pathetic little nerd… my pathetic little nerd~

Jenna’s hips twitched. She was grinding against her hand through her shorts, her cunt drooling into her panties. Her breathing was hot, heavy, and she knew her nipples would be poking through her thin halter top. The sweat-soaked fabric felt so good against her soft, sensitive tits…

Fuck. This was crazy. Jenna glanced from side to side, but the corridor remained stubbornly empty. No reason to stop masturbating out in the open, with waves of pleasure crashing over her as she shook with nervous energy, and no reason to stop what she was doing… but she had to stop this, she couldn’t do this… it would be unspeakably cruel to actually inflict this on Lily… but… fuck, that was what made it so hot, that girl was just the perfect victim…

“Ngghff… hhaaa…” Jenna gasped as her hips bucked against her palm. Shit. She had to go to the bathroom right now and take care of this, rub herself raw until she came at least a few times. And by the time she was done, the collar would probably switch to sleep mode to save power, and she wouldn’t be able to connect to it without opening Lily’s locker and physically turning it back on. Jenna had to stop messing around and turn down the voltage, right now, before she left and got locked out.

Jenna placed her thumb on the slider again… and with some difficulty, turned both settings down to two. There was no need to take this too far. Because… this was just a prank, right?

Right. Just… a prank…

Jenna made to close the app. Then paused, swiped back to the voltage levels, and dialled both of them up to ten.

She shivered, let out a high, gasping moan… and then walked away.