She reaches the library without incident

With most of the students either engaged in classes or undertaking their own personal study sessions, Anna found the hallways empty as she made her way towards the library. The towel stayed in place and it felt good to have her feet covered once again. Everything seemed to be going great... right up until she reached the library. It was busy with students - most of them from her own grade - engaged in study.

Anna knew the library well. There was a single entrance to it - a wide archway with two double doors which were always wide open during school hours. There was a fire escape door at the back of the library but that was alarmed and couldn't be opened from the outside, so she couldn't sneak in that way. In front of the archway were the computer terminals; two banks of computers, back to back, with students sitting on either side of them. The librarian's desk was to the right of the archway so that the librarian on duty could see the computer screens and anyone entering or exiting the room. To the left were two low rows of shelves containing references which identified where books could be found. The rest of the room was dominated by 25ft high book shelves set out in neat rows, back to back, while at the far end of the room, against the back wall, were empty tables for studying. The ones that Anna could see were currently occupied.

Anna entered the room and immediately turned left, towards the reference shelves, and stood behind it nervously. She quickly scanned the room to see if anyone had taken note of her and her 'skirt'. The librarian was busy stamping books, and the people on the computers were too engrossed with whatever they were doing to pay attention to her. She gave a sigh of relief. She flicked open the phone and looked at the message again.

"Library. Romeo's got your panties in his face."

That meant Shakespeare. She looked at the information for "S" and found that Shakespeare was in the 2nd row of book shelves and roughly in the centre of it. She grimaced as she realised it was in Section A. That meant it was on the very top shelf and would need to be accessed via a ladder. Usually students would need to ask a librarian to collect those books but Anna wasn't prepared to do that; partly because she didn't want anyone to look too closely at her 'skirt', but mostly because a pair of panties would be wedged in the book once found. That would be difficult to explain. Anna moved quickly from the reference shelves and into the 2nd row of books, hoping that nobody noticed her.

She found herself alone in the row. The hefty weight of books surrounding her seemed to mute the sound from the rest of the room so that it seemed to be isolated from everything else. The ladder was connected to the top and bottom of the shelf on a rail with wheels at the bottom and top to help it slide smoothly into place. Anna moved it into position and then set the locks so that it wouldn't move. Then she placed the phone on one of the shelves since she'd need both hands free.

She began to climb.

With the first step she felt the towel tighten against her waist. The second step felt better, but she was immediately reminded that it had felt just fine at her locker only a few minutes ago - and that's when it had fallen off. She stood two steps up and, with one arm hugging the nearest rung, used her other hand to tighten and adjust the towel. It was tricky to do but it felt manageable. She took two more steps, then stopped to fix herself again. Step step fix. Step step fix. She soon found herself within arm's reach of Section A. She stared at the books all lined neatly in a row; Othello, The Tempest, Caesar, Hamlet. There! She reached out and eased Romeo and Juliet out of it's place. Sticking out of the top of it was white material, although something about it didn't look right. She tugged them out of the book - and gasped.

The panties she had worn to school today had been plain white cotton panties. And while what she was holding in her hands were undoubtedly _her _panties, they were not the same pair. They were a much frillier, sexier pair - a thong, in fact - that she'd worn to school about two months ago and had somehow lost after gym class. She'd had to wear gym shorts under her skirt that day and had been baffled as to where they had gone. Apparently Natasha had taken them. And held onto them. And either brought them to school each day or kept them there. That was... worrying.

Unfortunately for Anna, her attention soon shifted as she felt something brush her hip. It was the towel. She grabbed downwards to stop it but caught only empty air; the towel plummeted downwards and fell into a heap at the bottom of the ladder. Anna stood on the ladder twenty feet in the air feeling incredibly exposed in just a shirt, socks, and shoes. Her exposed sex was facing the books, at least, but nothing hid her rear end from view. She tried to descend immediately but found the panties made it difficult to grab the rungs. Realising how stupid it looked, Anna had **** but to grab the panties in her teeth so that her hands were free to climb. She began to move downwards as quickly as she dared. It felt like an eternity. She kept telling herself that somebody was bound to find her...

She reached the ground safely and took the panties out of her mouth. She looked around for the towel... and it was gone!

"How?" she muttered to herself.

She looked around the row desperately. How the hell could a towel just disappear? It had fallen straight down, of that she was certain. It should have been at the bottom of the ladder. This was like some sort of nightmare. It didn't even occur to her to put the panties on; they sat bundled in the fist rested against her hip as she tried to make sense of what she was seeing. She almost jumped out of her skin when the phone buzzed. Worried about the noise it would make, Anna quickly picked it up and pressed a button to stop it. The message on screen read:

"You should have looked down while you were climbing. You would have seen me looking up in awe! What a view! Got your towel anyway. It stinks!"

"Fuck's sake Natasha." Anna muttered. She looked around, half expecting the skinny blonde to be watching her, but she was as alone as before.

With no other covering in sight, Anna eased her panties on over her shoes and slid them into place. The fabric was light and frilly, and left 95% of her butt cheeks exposed. The crotch covered the bare minimum and the material resting over her hips was narrow.

The last article of clothing would be the skirt, and Natasha had promised to reveal it's location during the next (and final) class of the day. By Anna's reckoning there was still fifteen minutes to go. That left her with options. She could hide out here and hope that nobody comes this way, then slip out of the library once it's quiet. She could move now and hope everyone would be as distracted by their work like they had been when she'd come in. She could try the fire escape; it was alarmed, but if she moved quickly she might be able to get away before anyone saw her. Or she could walk out as bold as brass and not bother to hide her state of undress; after all, the students here were mostly in her year group and that meant most of them had already seen her naked today anyway. Why be embarrassed about a thong?