A/N: So, a) I've made it realistic in actually using some things from a physical chemistry course and b) the quantum mechanics that Beca makes fun of at the end of this chapter is actually beyond an undergraduate chemistry course (usually) but I so wanted to make fun of the equations.

Disclaimer: I don't own PP or PP2.

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A week came and went. Stacie was relieved when nothing was brought up about where she was Thursday night. It wasn't that she didn't trust Beca, she did, implicitly. But things slip with as close as Beca and Chloe were, things might just get brought up. So here she was, grabbing the key to room 312 again on a Thursday night. She smiled at Olivia, the librarian on duty, as she took the key. She got settled in the room, her chemistry books open and ready when there was a tentative knock at the door. She looked up and then smiled as she saw Beca standing there, her face pressed up against the window making a goofy face. She got up and opened the door, letting the smaller brunette in. Beca just breezed by her and set her bag next to the same chair she sat in last week, "Well, I was so productive last week that I thought I might give this library studying a go. You don't mind, do you? I mean, if I'm cramping your studying style I can go. I mean, I don't want to bother you, but it was nice last Thursday."

Stacey cut her off, "Beca, hush. You're rambling. Of course it's alright for you to work in here." She went and sat back at her spot, "Besides, I liked having someone else in here. The room didn't feel so empty."

Beca smiled, pulling her stuff out of her bag and getting situated. The girls worked in a comfortable silence, the only sounds being the moving of pages, a pencil across paper or the occasional clicking of keys being pressed on Beca's laptop. After about an hour and a half of working, Beca let out a long sigh and leaned back in her chair, stretching. She looked over at Stacie, "What are you working on?"

Stacie finished writing something before she looked up at Beca, "It's Physical Chemistry. We're on thermodynamics right now."

Beca stood up and walked over behind Stacie, looking over her shoulder. She looked at the paper and gave a shrug that Stacie couldn't see, "Looks like some kind of code to me. It's just a bunch of numbers separated by G's, H's, T's and S's. What does that stand for, Gosh That's Hard, Stacie?" Beca smiled at her joke.

Stacie chuckled, "No silly. The letters are different thermodynamic values and the numbers are their values. Oh, and the T is for temperature."

Beca looked closer at the paper, "Ummm Stacie, if T is for temperature, where does it ever get to be almost 300 degrees?"

Stacie laughed outright, then saw Beca's crestfallen look, "Oh I'm so sorry Beca, I wasn't laughing at you. I was just remembering how different chemistry can be from what we use in our everyday life and I thought it was funny." Beca seemed to be placated a bit by that explanation. Stacie continued, "That temperature is in Kelvin. You've heard of absolute zero?" Beca nodded. Stacie continued, "Well zero Kelvin is absolute zero. So 298 Kelvin is about 75 degrees Fahrenheit."

Beca gave a sigh, "How do you make sense of all that?" She pointed at the paper and her books.

Stacie smiled, walking over to Beca's bag and pulling out some music sheets with Beca's scribbling on them, "How do you put all of these together to make something that sounds awesome?"

Beca shrugged, "I just do."

Stacie smiled, "Exactly."

Beca laughed, "Touché, Legs. How about we take a break and I buy you another juice?"

Stacie looked over at the homework on the table and then at the grinning brunette next to her, "Sure, but it's my turn to buy."

Beca shrugged, "Like I'm going to turn down free coffee."

Stacie smiled, and as she opened the door for Beca to walk out she quietly said, "I'm glad you decided to come study here."

Beca put her hand on the hand Stacie had on the doorknob, giving it a small squeeze as she walked by, "So am I Stace."

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Thursday nights in the library became their thing. Stacey would show up on 'her date' at 7:00 p.m in room 312 of the library. Beca would show up anywhere from five to fifteen minutes later. The girls working in silence most of the time, but on those nights that they didn't have a lot of pressing homework, they would talk. Sometimes they'd talk about the Bellas, other times they'd talk about the current series they were watching on Netflix, but they seemed to have an unspoken agreement to never delve too deep into each other's personal lives.

Beca started paying more attention to Stacie at the house. She noticed the taller brunette would always look a little uncomfortable when someone would bring up all of her dates. She would also get this slightly panicked look when someone would talk about all of her sexual escapades. She hid it well, but Beca had spent enough time with her now and she was paying attention. She wondered why, when Stacie had always appeared to be so forthcoming with her sexuality. Beca also started to make a game out of Stacie's dates, trying to guess which ones were actual dates and when she was going to hang out in the library and study. That's how she found herself outside room 312 one Friday evening.

Stacey had gone out for her date and Beca smirked as she walked out the door, "Date, my ass," she thought to herself. About an hour later, she made some excuse about needing to go to the store for chips and soda. She wrote down the list of things the Bellas screamed at her as she was going out the door so she wouldn't forget them. Instead of going right to the store, Beca stopped at the library first. She knocked on the door to the room and Stacie looked up and smiled at her through the window.

Stacie opened the door, "What are you doing here Becs?"

Beca handed her a USB key, "I made you a mix to listen to while you study. I didn't know if you could focus or not if you have music on but it helps me sometimes. I thought you might like some of this stuff, it's not too heavy and it's a little more on the instrumental side so you don't really have to pay attention. Oh God, I'm rambling again."

Stacie took the USB key from her, "I can't always listen to music when I study, but I think this might just be what I need for those times that I can."

Beca scoffed, "You haven't even heard it yet."

Stacie winked, "But you made it, so I know it will be just what I need. You've seen me studying so I trust you."

Beca blushed at the compliment, "Well I know how hard you work at this, I didn't want you to get too stressed out. I thought some music might help."

Stacie pulled the smaller girl in for a hug, which Beca surprisingly returned, "Well thank you Beca, I think this will be a perfect stress reliever."

Beca looked over at Stacie's books, looking like she wanted to say more. Instead, she pulled back from the taller girls and stepped back into the doorway, "Well it looks like you have some alphabet soup to get back to and I have a list of things that the Bellas just had to have when they found out I was going to the store."

Stacie chuckled, "The store, huh?"

Beca smirked, "Well I couldn't tell them I was coming to check on you in the library, now, could I?"

Stacie shrugged, "Guess not. Hey, would you grab me some barbeque chips when you're at the store, I'm all out at the house."

Beca grimaced, "You too? Fine, I'll get you your damn chips, but you owe me Conrad."

Stacie laughed, "Yah, yah Mitchell. I'll owe you, whatever."

Beca was grinning from ear to ear as she let the door close behind her so Stacie could finish her studying.

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The end of the semester was just around the corner and both girls were meeting in the library three nights a week as they were trying to get everything finished up before finals. One night as they were sitting there, Beca was surprised out of her thoughts when Stacie groaned and hit the table before pushing her books back, "I'm never going to get this shit!" Beca looked over at the frustrated girl with a raised eyebrow to which Stacey sheepishly responded, "Ooops, sorry." She pulled her books back around her and started writing again before looking at another book and writing some more. Beca watched her work for a few seconds before going back to her paper. Stacie didn't last five minutes before she dropped her head on the table with an exasperated sigh.

Beca smirked as she got up and walked around the table, stopping behind the taller girl and rubbing her shoulders. Stacie groaned without lifting her head from the table, "Fuck that feels good. This quantum mechanics has really got me stressed out. I'm never going to get it."

Beca kept rubbing, taking a look over her shoulders at the papers spread out in front of the taller girl, "Hmmm, let's see, maybe I can help…it looks like you are working on Shrek."

Stacie snorted into the table as she peered back over her shoulder, "Shrek huh? How do you get that?"

Beca worked her thumbs into a knot in Stacie's shoulder for which she received a groan, "Well, that upside down triangle looks a bit like Shrek and he's missing an ear. If he had a two on both sides, he'd have both of his ears. And then there are all of the letter villagers with pitchforks running around trying to get him. See, and that one is trapped on the other side of the fence, or maybe he's safe over there." She finished her thought pointing at the equals sign in the equation.

Stacie pulled her head up out of her hands and looked at the equation she was working on and started laughing, real laughter, "Oh my God Beca, only you would see that in the three dimensional time-independent Schrödinger equation. Dammit, now I can't unsee it."

Beca smiled at the laughing girl as she walked back to her spot, "My work here is done."

Stacie smiled at the small alt girl across from her, a warm feeling spreading inside her.

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A/N: I know you aren't technically supposed to put notes at the top and bottom, but I didn't want to put the equation at the top – a simplified version of it looks something like

∆2Ψ + VΨ = EΨ except flip the triangle (I couldn't find the symbol for it in Word).