If the school's cafeteria was the most popular and busy destination for its students, then the library was easily on the opposite end of that spectrum. While no student at CHS outright shirked their studies, they nevertheless rarely came to this place, leaving it perhaps as silent as most people would expect a library to be. Although, to be frank, that often left the resident librarian, Cheerilee, very happy. However, of the few students who did choose to be here today, by far the most notable was Sunset Shimmer. There, the former unicorn sat at her favourite desk, pouring over book after book, looking desperate to find the one tidbit of information and knowledge she sought. However, given the look of frustration upon her face, it was clear that she was getting nowhere fast.

"Ugh! There's got to be something here I can use!"

Page after page she turned, her eyes as sharp and focused as ever as she continued on her search. However, unbeknownst to her, a single figure was approaching from behind, taking very careful steps, lest the girl hear it. Finally, it struck, reaching around from behind to embrace Sunset, with familiar yellow hands clasping in front of the girl's chest.

"Guess who?" the voice asked in a sultry manner.

"GAH!!!" Sunset called out.

Needless to say, in an environment as neat and well-kept as this, Sunset's sudden outburst earned her a very loud "shhh" from Cheerilee, who, as always, disappeared behind a nearby bookcase as quickly as she had come. Slapping a hand over her mouth, Sunset spun around as soon as the mystery hands let her go, seeing, as she'd suspected, that a certain fellow Equestrian was there, smirking right back at her.

"Always a pleasure, Sunset."

Adagio Dazzle, the eldest of the Siren sisters, stood above Sunset with a hand upon her hip, looking as confident and sure of herself as ever. As one would expect, Sunset was in no mood for such interruptions at this point, as evidenced by the scowl she gave as she kept her voice as hushed as possible.

"Adagio! What are you doing?"

Chuckling to herself, the Siren walked around the desk to the other side, swaying her hips in that usual way of hers, before grabbing hold of a nearby chair and taking a seat opposite Sunset.

"Oh, Sunset. Where's the fun in having friends if you can't enjoy a surprise grope every once in a while?"

Shaking her head at such a remark, Sunset let out a groan of annoyance before looking back down to her book.

"Adagio...look...I'm really busy at the moment. I'll talk with you later, okay?"

Raising an eyebrow, Adagio noted the manner in which Sunset had spoken to her, which, naturally, piqued her interest.

"My my. If I didn't know better, I'd say you had something important on your mind."

The sarcasm in her voice was clear, and earned her yet another scowl from Sunset.

"It...it's personal, okay?"

To that, Adagio merely smirked again.

"Oh, my dear girl, now you simply have to tell me what's going on!"

Looking up from her book again, Sunset raised an eyebrow, regarding Adagio for a few moments of silence before slumping her shoulders in a gesture of defeat.

"You're not gonna leave until I tell you, are you?"

Shaking her head, Adagio gave Sunset the answer she sought, leading to another groan on the part of the latter. After yet further silence, the younger Equestrian looked over her shoulder, making sure that she was out of earshot of any potential students, before looking back to her guest. With that done, she finally spoke, though made sure to be as quiet as possible when doing so.

"It's just...my friends and I have learned that our using Equestrian magic may have made us...well...go into heat."

Hearing that, Adagio's face went about as blank as Sunset could ever remember seeing on her, just like her friends had looked when she had told them about this. But, in stark contrast to how they had reacted, when Adagio finally spoke up, she did so with a look of almost amusement.

"Oh...that is so...cute!"

Sunset frowned at that.

"Adagio! This is serious!"

Chuckling again, the elder Siren leaned back into her chair before answering that.

"Oh, I'm sure you think so, Sunset. It's just...so amusing to me that you girls actually end up in this position, all raunchy and in need of a little love."

Sunset rolled her eyes at such words, and Adagio then leaned in closer.

"So...which lucky fellows are you girls going to be relieving yourselves on?"

Sunset snapped her head back in Adagio's direction, shaking it fiercely.

"Oh no! We are not doing that! We're going to keep control of ourselves and avoid that sort of thing in any way we can!"

With that, Adagio's smile faded, and she took on a mild frown of her own.

"Hmph. Spoilsports."

Shaking her head, Sunset got back to looking at her book at last, at which point Adagio finally regarded the thing.

"So...I assume this little project of yours has something to do with your...hot problem?"

Sighing, Sunset looked back up at her.

"I'm trying to find a means of making heat-suppressants. Back in Equestria, there were a number of plants and herbs that, when ground up and added to water, could help lessen the effects of heat."

Adagio nodded.

"I see. So you're trying to find those plants now, in this world?"

Sunset shook her head.

"Afraid not. I already know that's not an option."

Adagio raised an eyebrow, displaying clear curiosity over that, which prompted Sunset to explain herself further.

"It's just...when I first came to this world, all those years ago, I was acting under the assumption that girls worked in the same way that mares did, with heat and everything. Before I discovered how they actually worked, I tried searching for those plants, only to find they didn't even exist in this world."

Looking away for a moment, Sunset took on a brief look of near-relief.

"Fortunately, by that point, I came to understand how things really were for girls here, so I wasn't too bothered about it."

For a moment, Adagio looked somewhat confused.

"So...if you already know they don't exist...?"

Sunset looked back to her, already figuring out what she was going to say, and let out a sigh.

"I know the exact plants don't exist, but I'm hoping, with enough research, I can find some other plant with a similar enough chemical makeup that can act as...I don't know...a substitute or something."

Adagio nodded, showing she understood, after which she leaned back into her chair again.

"Well, if you or the other girls ever decide to just go ahead and embrace your sudden urges..."

Her usual smirk reared its head again.

"...feel free to come to me for advice on how to deal with that."

Again, Sunset rolled her eyes.

"Yeah, I'll be sure to take that into consideration."

Adagio raised a hand to her mouth, stifling a hearty laugh at Sunset's reaction, before leaning forward again and speaking up.

"Well, whatever plan you have, I suggest you get to it, Sunset, given how far along you are in this problem."

Sunset nodded, getting back to her book. But, after a few minutes of reading, she stopped, looking back up to Adagio with curiosity plastered all over her face.

"What...what do you mean?"

Again, Adagio smirked.

"I mean...and there really is no other way to say this...but you smell good today."

Needless to say, Sunset was both confused and disturbed by such words, and stared at Adagio for some time. The Siren stared back, retaining her smirk, causing Sunset to think hard on her words. Then, one thought in particular crept up into the girl's mind, causing her eyes to widen slightly. Looking down at her left wrist, she slowly brought it up to her face and, after a few moments of hesitancy, took a single sniff. There it was. A smell, and not one she'd ever noticed before now. It was faint, and the kind of smell that wouldn't have been noticed unless you knew to look for it. But, after just one whiff, recognition now crossed Sunset's face.

"...Pheromones."

Adagio nodded.

"Yep. One of the many little presents your heat weeks are going to give you. A boy passing you by probably won't notice it at all, but once he gets that in his system...well... he wouldn't get all lustful like you, but let's just say he'd be a little less resistant than normal."

Sunset looked to her with clear concern in her eyes.

"I need to make these suppressants, and fast!"

She then buried her face in her book, all while Adagio folded her arms and chuckled slightly.

"Oh, don't be so dramatic, Sunset. I mean, it's not as if prim-and-proper girls like you or the others would let any boys be near you during all this, right?"

For a moment, Sunset said nothing, staring intently at her book. But, after a few moments of silence, Adagio's words began to sink in for her, and she slowly looked up, with a look of horror upon her face. Adagio saw this and was, naturally, confused, yet remained silent as Sunset spun around in her chair, looking towards the direction of the hallway.

"Oh Faust! What have I done?!"