A/N: This will be a multi-chapter fic so let me know what you think of it. Reviews are always appreciated :)

Puck walked into the library twirling a pencil between his fingers and slapped his paper pass on the circulation desk. He'd cleverly told his math teacher, Mr. Kirn, that he needed a pass to the library to work on his research paper for English. He had a whole line of excuses and he hadn't been to a math class in over a year. Usually he'd hangout in the gym or, better yet, leave school but today Jewfro the hall monitor stopped him before he could get anywhere so the library would have to do. It could've been worse; there were computers in the library and Puck knew exactly how to bypass all the blocks the school put on his favorite websites.

Puck walked to the back of the library to the computer facing away from the librarian in the far corner of the room. It was partially obstructed by the bookshelves there and gave him just enough privacy not to get caught. Perfect. He settled himself at the computer and turned it on. He looked around while he waited for the school's ancient computer to start up. It was then he realized someone was sitting crouched in the midst of the dark, reclusive stacks that offered him his privacy. Rachel Berry was sitting on the floor reading a book, protectively hunched over it. Intrigued, Puck abandoned his computer and walked over to where she was sitting. She didn't seem to notice he was there at all; she was completely immersed in whatever she was reading.

"Berry?" Puck asked. "Whatcha doing?
Rachel gasped and looked like she almost had a heart attack. "Oh my god Noah! You scared me," she said as she clutched her book closer to her chest and brought her knees up to cover the back of it.

"What are you reading?" Puck asked, his eyebrows raised.

"What?" Rachel said unsteadily, "Nothing… Just something for class."

Puck looked at her questioningly. "Let me see it," he challenged.

Rachel looked slightly mortified. "No!" she said, but then regained some of her composure. "I'm just doing some research on the Crusades for AP European History. It wouldn't interest you anyway."

"No, come on," Puck sat down next to her. "I love learning about… whatever that shit was." She shot him a dirty look. "Well fine," he continued, "don't give me the book. Just tell me what you're researching."

Rachel relaxed a tiny bit and began to tell him about what they were learning in class. "Well Noah the Crusades were a series of religiously sanctioned military campaigns that took place in Europe in 10—Hey!" Rachel protested as Puck grabbed the book from her lap.

"Holy shit Berry, what it is this?" Puck laughed as he looked the cover of the book, It's Perfectly Normal: Changing Bodies, Growing Up, Sex, and Sexual Health. Puck opened the book to the table of contents and looked at the some of the headings: Puberty, Our Bodies, What is Sex?, Making Babies, Making Love. Puck continued to laugh as Rachel blushed deeply and buried her face in her knees.

"Just give me that back!" She grabbed the book from his hands and pulled it close to her again.

"Aww I'm sorry, Berry. I didn't mean to make you feel bad." She inched away from him. "Just tell me," he said, somewhat lowly, "what were you reading about?"

Rachel grimaced before saying, "I will absolutely not tell you that."

"Please?" Puck pouted. "Hey, wait." Puck said suddenly. "Weren't you the one who gave the big speech about how girls want sex just as much as boys and blah blah at the celibacy meeting?"

"Yes I did, Noah. I've read that in many articles –"

"You read it in articles? Berry come on! Do you need a book to tell you everything? That's something you should just, feel." He moved even closer to her.

"Well, um…" Rachel never really formed a thought before Puck continued.

"You think you can learn everything about sex from this stupid book? This book is nothing compared to the real deal." He placed his hand on the inside of her knee and began rubbing his thumb against it slowly. He pressed his face close into her neck and let his breath weave through her hair. "Do you want to learn, Berry? Really learn?"

Rachel's breath hitched and her throat before she abruptly got up and adjusted her skirt. "I have to get to class!" She to turned to leave and then stopped to quickly pick up her book and huffed out of the library. Puck only smirked to himself as he watched her leave.

Later that day when Puck walked into Glee rehearsal he saw Rachel look at him nervously and then dash to the other side of the room to stand by Kurt and Mercedes. Sighing, Puck walked over to her and grabbed her gently by the arm to pull her aside.

"Relax," he said. "I'm not going to tell anyone about your dumb book. Our little secret, okay?" Rachel nodded and swallowed hard and left quickly again.

Rachel did not relax for the rest of rehearsal. She seemed to be on edge the entire time. And every time Puck came somewhat close to her, she seemed to start shaking. He already told her, why didn't she believe him? He'd have to talk to her again after Glee to reassure her that he wouldn't tell anyone about her book.

He went to find her after rehearsal was over but apparently she beat him to the punch. He found himself being pulled by his t-shirt into the back of an abandoned hallway. A very nervous looking Rachel Berry was there when he turned around.

"God, just chill out Berry! I'm not going to tell…" Puck stopped when he realized she was shaking her head. She let a shaky breath in and out slowly and then looked up at him.

"Teach me."

Oh.