Just a heads up that this chapter is rated L for lewd.

Chapter 3: Check Out

There were times when Yuzu felt that Mei was the epitome of caution.

Often it was exceedingly difficult to get the raven haired girl to just consider doing something that she considered "dangerous" or "immoral", such as the numerous times Yuzu had asked her to hang out with her after school. It was during times like those that the blonde felt furthest from her sister, as it became apparent that the two of them could not be any more different from each other.

But then there were the days when Mei was almost…scarily spontaneous. She would sometimes do things that caught Yuzu completely off guard, and though she was always happy to be the receiver of the girl's more honest side, she wished there was a way to anticipate them sooner.

Like right now.

"Keep quiet, Yuzu," Mei whispered under her breath, punctuating her words with a flick of her tongue over the blonde's exposed nipple.

Yuzu bit her lip so hard it hurt and turned her head to the side, cheek pressing against the spine of a book. Mei had her pressed against a bookshelf in the deepest corner of the school library, the top three buttons of her shirt hanging open and the rest of her clothes at haphazard angles. She was caught between wanting to avoid getting caught and wanting to moan Mei's name, and the dilemma was squeezing her chest until it felt like it would burst.

Smiling at the blonde's obvious effort, Mei closed her mouth over Yuzu's tit once more. Her hands held the taller girl tightly around her shoulders, elegant fingers pressing firmly against the flushed skin of Yuzu's neck as she serviced her older sister.

Yuzu whimpered quietly, her own hands scrabbling desperately at the spines of the books stacked neatly behind her. Their class had come into the school library for a study hall, seeing as they had a substitute today, and within five minutes Mei had stood up and beckoned for Yuzu to come and help her find a book.

She had followed along willingly enough, delighted that Mei wanted her help. They hadn't talked very much in the past week, since Mei had been so busy with work. She was looking forward to spending some quality time with her.

It turned out that Mei did indeed need some help, but certainly not with locating a book. She had turned and pinned Yuzu to the wall the minute they stepped behind the shelf, and before the blonde knew it they were in this ridiculous situation.

"Mei," Yuzu breathed as softly as possible. "We're going to get caught…"

Mei stopped sucking the blonde's nipple into her mouth long enough to look up at her. Yuzu's face was impressively red, partly due to the arousal and party because of the incredible restraint she was exhibiting. She found the sight to be almost unbearably sexy.

"So you don't want to?" she whispered back, pressing her lithe body flush against her sister's.

Yuzu shuddered at the increased contact, eyes slipping back in her head as her lids fluttered. "N-No. I do."

"Then shut up. We're in a library." Mei took the girl's nipple gently between her front teeth and tugged for emphasis, before flicking it with her tongue.

Yuzu clenched her teeth so hard she was afraid her jaw was going to break. If Mei wanted her to be quiet, she shouldn't be making her want to scream! A loud moan was bubbling dangerously close to the end of her throat, and it took all of her admittedly paltry willpower to keep it suppressed.

Her thoughts were immediately obliterated when Mei pressed her thigh in between Yuzu's legs, shifting slightly to get a good angle. A stupefied groan slipped from between her teeth at that moment, but not before Mei reached up and locked their lips together, both girls breathing harshly out of their noses as they kissed. Yuzu's moan was muffled by the insistent pursuit of Mei's tongue, caressing the back of the younger girl's throat.

Mei felt her pulse quicken at the sensation, and she fisted Yuzu's hair between her fingers. Her control was considerably better than the blonde's but this was Yuzu they were talking about here. Even she was liable to let a cry slip through if she wasn't careful.

"Yuzu," she said breathlessly, closing in for another kiss. Yuzu whined softly when their chests pressed together, Mei's clothed one against her bare one. The soft material of the younger girl's shirt ghosted over Yuzu's exposed skin and sent goosebumps erupting over its surface. Hands shaking, the blonde reached up at clutched at the back of Mei's shirt helplessly, exerting all her focus just to hold on to the girl, her hips jerking sporadically across the smooth skin of Mei's leg.

Mei seemed to smile at the utter dominance she was exercising over her partner, and Yuzu felt her cheeks burn with a fresh wave of embarrassment. She would like to be a bit more composed when things got like this, of course, but god it was Mei. Mei, who was so terrifyingly good at reducing her to a wanting mess. It was a power that Yuzu both loved and feared. When her sister got serious, there was virtually nothing she could do.

Yuzu bit back a disappointed moan when she felt Mei's knee retract, so that it was no long pressing firmly against the junction between her legs. Her core began to throb with need almost immediately, and she was about to risk making noise to beg Mei not to stop when the girl slid one hand down the length of their bodies before slipping two fingers inside.

Yuzu gasped audibly when Mei abruptly filled her, hips jerking instinctively to get closer to the source of pleasure. She nearly moaned when her hips ground against Mei's hand, hilting the long fingers as deep as they would go. If it kept going at this pace, she was going to-

Mei's other hand suddenly slapped itself over her mouth, startling her. When she brought her bleary eyes down, she saw her sister's sinfully dark eyes staring back. Beyond them, in the undefined space between their bodies, Yuzu could see Mei's hand buried inside of her skirt and panties.

"Shh," Mei said, an intense expression on her face.

It was only then that Yuzu heard the voices on the other side of the bookshelf, quiet enough that she had completely missed them in the heated daze she had just been trapped in. Her green eyes widened in panic when she recognized one of the voices to be Harumi's.

"You sure you know where this book is, Hime-chan?" The gyaru's voice said, floating over the top of the bookshelf to fall on top of Yuzu's terrified ears. "I've been looking for it this whole time…"

"Of course I do." Himeko's annoyed tone joined Harumi's, and this time it was Mei's turn to swear internally. "I was on the library staff before I became the vice president, you know. We'll find it."

"If you say so…"

Mei's fingers had gone completely still inside of Yuzu at this point, for which the blonde was partially glad. She had been extremely close to finishing right then and there. If they screwed up now, they were going to get caught for sure-

Mei's fingers twisted inside of Yuzu's cunt, twisting once before hilting themselves once more.

The blonde's heart exploded violently inside her chest as pure panic rushed through her veins. She stared at Mei with shocked eyes as the girl's hand tightened even further against her mouth, in an attempt to stem the cries that were inevitably coming.

Oh my god. This is insaaaaneeeee… Yuzu thought wildly as Mei began fingering her in earnest, putting her wrist at just the perfect angle so that she could reach as deep as humanly possible. Then she pressed her face against the curve of Yuzu's neck, her hot mouth breathing quiet puffs of air against the excited skin.

Yuzu could still hear Harumi and Himeko talking behind her, but the two girls seemed to be in an entirely different universe by this point. A soft squeal nearly slipped out from between Mei's fingers, and the younger girl turned her head and bit Yuzu in punishment. Which was a little stupid in retrospect; she very nearly yelped when she felt Mei's teeth prick her skin.

Holy crap. Mei was breathing as harshly as she dared against the hollow of Yuzu's throat, her fingers moving at a steady rhythm that she didn't dare to increase. The blonde was already incredibly wet, and going any faster could make their lovemaking audible to the others in the library.

She felt Yuzu's lips moving beneath her palm, and she looked up to see that the blonde was opening her mouth in a silent scream, hot puffs of breath slipping out to warm Mei's skin. Mei instinctively kept the pressure before her fingers up, and before she knew it they were falling into Yuzu's mouth, the index and middle finger dipping inside to press against the blonde's tongue.

Mei's eyes widened at the mistake, and she was about to withdraw her hand when Yuzu instinctively closed her lips around the fingers and started sucking.

Something unfathomably profound seized the pit of Mei's stomach at the sight, and suddenly she realized how ready she had become while stirring her sister up. Biting her lip as Yuzu continued to pant around her fingers, she began to grind her clothed arousal against the blonde's thigh, the rhythm of her hips matching the hand still buried deep inside Yuzu's core.

The blonde nearly sobbed when she felt Mei getting herself off against her, as her saliva began to thoroughly coat the digits stick inside her mouth. Mei bit down on her shoulder hard enough to draw blood before curling her fingers inside of Yuzu, and suddenly they were both nearing that tantalizing peak, bumping and grinding and thrusting feverishly against each other in a desperate, silent race to reach the top.

Then they were both climaxing in unison, and it was Mei who couldn't help letting a small moan squeak out past her lips as she screwed her eyes shut, body riding out an incredibly powerful orgasm. She didn't know if it was the thrill of doing this in the library, or the people standing all around them, or that Yuzu was still sucking vigorously on her fingers like they were candy.

They both came down with tensed bodies, Mei holding Yuzu's hair fisted in her hands as she took deep, shuddering breaths. Her body seemed to have gone limp, and it was only the blonde's knee still pressed against her core that kept them both upright.

Yuzu's chest was rising and falling like crazy, and her cheeks and chest were flushed. Behind her, she could hear her friends' voices fading as they returned to their seats, having apparently found the book they were looking for.

Looking to the side, she saw a small space in the rows of books where Himeko had taken out a certain volume, and realized just how close they had come to being caught.

Casting a stern glance down at her sister, who seemed to have mostly composed herself by now, she demanded softly, "How could you corner me like that here of all places? We almost got caught!"

Mei just gave her a small smirk, reaching up to tuck a strand of blonde hair behind an ear. "I had faith in your control."

Yuzu gave her a dubious look. It occurred to her that Mei had been the one to suggest this study hall in the first place.

"You weren't even planning on checking anything out, were you?"

Mei just smiled as she buttoned Yuzu's shirt back up, tugging the girl closer to her when her fingers reached the top of the collar.

"Not a book, at least," she said, before giving the girl a sweet kiss.

Sometimes Mei was wonderfully spontaneous.

This chapters was inspired, in part, by chapter 32 of angel0wonder's story, 'Citrus Schtuffs.' You can think of it as an extended version of that chapter, if you'd like. Pretty much just splurged this out in half an hour. I hath no shame.

I was working on something original, but the ideas just weren't flowing, and I ended up writing this instead...such is my destiny.

Thanks for reading!

~Banshee