Evolve
Isaac Lahey fanfiction
Reader x Isaac Lahey
Prompt - This fanfiction is based loosely off of Teen Wolf Season 2, where Isaac first becomes a werewolf. You are new to Beacon Hills High School and you can’t help but develop a crush on your Chemistry partner. But how will your relationship evolve, once your crush is bitten by Derek and becomes a werewolf?
It was your first day at Beacon Hills High School.
Your mother had dragged you with her, out of the country and away from your comfortable, ordinary life in England.
You were conflicted. Part of you was excited to begin this new adventure, but the other part of you was terrified of being thrown head first into the unknown.
You walked along the fast paced corridors, looking around with curiosity at the different atmosphere of an American School. You made your way to your locker and took out the slip of paper with your locker combination on it.
You entered the code and exhaled with relief when you heard the click of the locker opening. You emptied out your bag, keeping only the books you would need for your first two classes in your bag.
You had decided to get to school early so you could get to know your surroundings and you still had time before your first class. You gazed out at the crowd of teens filling the halls, all laughing and joking with one another and you let out a long sigh.
“Classes haven’t even begun yet and you already sound fed up. That’s not a good sign.” You jump slightly at the sudden voice coming from behind you and spin around.
You were met by an amused look, and the guy smirked across at you. “Hi, you must by Y/N, the new girl from England. My names Stiles. My dads the Sheriff.” He offers his hand out to you and you shake it, glad that you had someone to talk to.
“Hi Stiles. My name is Y/N, I am from England and you sound pretty proud that your dad’s the Sheriff.” You smile at him, wanting to make a good first impression.
He laughs “Yeah, I guess you could say that. So what’s your first class?” He asks, continuing your conversation.
You pull out your class schedule, but before you can even answer, Stiles takes the paper from you and begins scanning the page. “Hey, my first class is also Chemistry, let’s go together, I can show you to the classroom!” He beams at you and you smile in return.
As you enter the classroom together, you were laughing at a joke Stiles was telling you. You were thankful that he had approached you and you were beginning to feel more at ease, until a stern voice cuts off your conversation.
“I see you’ve already latched yourself onto the new girl Stilinski? I hope you’re not planning on distracting her during my class and bringing her down to your level?” He looks down his nose at Stiles, before turning to face you. “My name is Mr Harris, I am you Chemistry teacher and I will not tolerate any misbehavior in my classroom.”
“M-my name is Y/N Y/L/N.” You stuttered, slightly intimidated by Mr Harris’s glare “And I promise to behave.”
“Yes, I know who you are Miss Y/L/N... and I will keep you to that promise. Now take your seat.”
You nodded in understanding and followed after Stiles, he pulled out the chair next to him, offering you a seat, but before you could sit down Mr Harris let out a condescending laugh. “Yeah, that’s not happening. Miss Y/L/N, please can you take a seat towards the back, next to Mr Lahey?”
You looked behind you and saw a tall, wavy haired boy look up suddenly at the mention of his name. The seat next to him was empty, so you assumed he was Lahey and you were meant to sit next to him. You looked back at Stiles and let out a small smile of apology and he smiled and shrugged in response.
You carried on walking to the back of the classroom and awkwardly sat next to the tall, wavy haired boy. He shuffled away from you slightly as you sat down and you couldn’t help but feel slightly offended. He was clearly uncomfortable having you sit next to him, but you didn’t want the rest of the year to be as awkward so you plucked up the courage to talk to him “Hi, I’m Y/N.” You introduce yourself and smile in his direction. He risks a glance at you and his eyes widen suddenly, before quickly looking a way.
You were about to look away feeling slightly defeated, until he whispers under his breath “Isaac... that’s my name.” His cheeks suddenly flush red and you’re shocked to feel a small tingling of butterflies forming in your stomach.
You tried to communicate with Isaac a few times throughout the lesson, but he would only respond if you asked him a question about the work and not once did he make eye contact with you. Usually you would find his behaviour rude, but you couldn’t help but find him endearing. Every time you spoke to him he would either play with his hair awkwardly, or a blush would form on his cheeks and you would find yourself thinking about how cute he looked.
You couldn’t help but wonder if he behaved this way with everyone, or with just you. So throughout the rest of the day, you couldn’t help but scout out the area, trying to catch a glimpse of him interacting with someone else.
You sat with Stiles and the rest of his friends at lunch. Glad that he also had some female friends you could speak to. Allison was the more welcoming of the two, but after half an hour, you could feel Lydia beginning to warm up to you. You tried to focus on the conversation at hand, desperately wanting to make a good impression and hopefully become part of the gang, but the sight of the slender boy sitting alone in the corner kept pulling away your focus.
You hear Stiles chuckle next to you, finally pulling your attention away from Isaac. You look away from him quickly and turn to face Stiles, not wanting to make it obvious you were staring. Except it was clear that the whole group had already noticed “I feel there may be a lot of actual Chemistry happening in Mr Harris’ class this year.” Stiles jokes, nudging at your arm.
You couldn’t help but blush and hit him back playfully “Yeah I agree, I could feel the sexual tension radiating between you and Mr Harris. I’m sure you’ll make a great couple.” You cause the rest of the group to laugh, glad to take the attention away from you and your obvious crush on Isaac.
It was finally time for your last class of the day and you were honestly surprised at how well your first day at Beacon Hills high School had gone. You had actually managed to make some friends and you had made a good impression in most of your classes.
You entered the classroom and looked around for an empty seat. There was no seating plan for this lesson and you noticed most students had already formed small groups and were sitting beside their friends. You spotted a free seat next to Scott and was about to approach him and ask to sit there when you noticed Isaac at the back of the classroom, with another student sitting alone in front of him.
You had noticed the other boy earlier at lunch, when you were scanning the room for Isaac and he had also been sitting alone then. You began to sypathise with him, knowing that if Stiles hadn’t approached you that morning then you might have been in the same position. Sitting alone with no one to talk to. You made up your mind and approached the large boy. “Hi I’m Y/n. Do you mind if I sit here?”
He looked up, clearly shocked that someone was communicating with him “O-oh, yeah...sure.” He responded.
You smiled warmly at him and began asking questions about himself. You found out his name was Boyd and he worked nights at the ice rink. You were glad to find him opening up to you as the lesson progressed and nearing the end of the class you were even laughing together like close friends. You couldn’t believe he had no friends at School, but he told you about how he got suspended last year for fighting, even though it was self defense and since then everyone else had been too afraid to approach him. You sort of understood why, as it was almost hard to believe Boyd was still in high school due to the sheer size of him. But luckily you hadn’t heard the false rumours about him yet and had gotten to know his true personality for yourself.
You were glad you had made another friend at school and you had gotten on that well together, that you had barely even registered Isaac sitting behind you both. However, you couldn’t help but risk a quick glance behind you before the lesson ended and you instantly made eye contact with Isaac. You swiveled around in your chair so fast you thought you had given yourself whiplash. How long had he been looking at you? Surely it was just a coincidence? Maybe he was actually looking at the board and you just thought he was looking at you? Or maybe he was just drawn to the movement of you turning around? Yeah that was probably it. I mean he had barely even looked at you during your first class. You let out a small sigh, and tried to calm down the beating of your heart.
Boyd glanced at you and smirked knowingly, passing you a note. You read it and your heart instantly began to beat out of control once again. It read ‘Isaac is a lucky guy.’ You scribbled a hasty response ‘What’s that supposed to mean?’ You thrust the note at Boyd and he leaned over and whispers in your ear “You know what it means.”
Over the next few weeks you had grown closer to both Boyd and Stiles and his group. Sadly, the one person you did want to get closer to was still barely paying you any attention and would mostly ignore you during class, unless you asked him a question about the work. That’s why, you were surprised when you showed up to your first class on Monday morning and Isaac was in his usual seat next to you. Except the aura surrounding him had completely changed, as well as his outfit and the way he was sitting. He was now sporting a black leather jacket, black jeans and converse. He was leaning back in his chair, rocking back and forth with his head held high, as he looked around the classroom. You noticed Scott glaring daggers in his direction and Stiles was looking back and forth between you and Isaac on the edge of his chair, as if he was readying himself to jump between the two of you. You looked back towards Isaac curiously and your heart skipped a beat when you noticed his dark eyes looking you over, a slow smirk beginning to form on his face.
You held your breath, not knowing how to react. He had never looked at you that way before and the seductive way he was staring at you caused your whole body to heat up. You began to walk towards him, almost as if you were in a trance. You were drawn in by his allure and you found yourself wanting to just give yourself to him there and then. You cautiously sat down beside him and it took all of your strength to greet him the same as usual “Hi Isaac. I hope you had a good weekend?” You internally screamed at how faint your voice had come out. It was so clear you had no control in this situation.
He chuckles darkly, the seductive sound causes a shiver to run through your body “My weekend was great. You could even say one of the best. But nothing compares to today...” He leans forward and whispers into your ear “This is my favourite class after all.”
You spent the rest of the lesson literally on the edge of your seat. A flood of emotions had passed through you in the space of an hour and just when you had begun to calm down, Isaac would lean in and whisper something into your ear or would “accidentally” brush his knee with yours.
You had no idea what had come over him. The quiet, shy Isaac you had come to know and like, had completely disappeared over night and was replaced with an overly confident, flirtatious persona. You had no idea which Isaac was the real one anymore, but either way you found yourself attracted to him.
You sat with Scott, Stiles, Lydia and Allison at lunch and Isaac was the main topic of conversation. “I think he’s better this way.” Lydia announced “He actually seems attractive now.”
Stiles looked at you “You better be careful Y/N, or Lydia is going to swoop in and steal your man.”
You punched Stiles lightly on his arm “He is not my man!” You turn to face Lydia “And he was attractive before! You just didn’t know the real him.” You confront her.
“And you did?” She responds “He barely even spoke two words to you before today.” She rolls her eyes at you.
You were about to respond before Scott interrupts “The main point is, he’s changed suddenly and I’d like to figure out how or why he’s suddenly acting different.” He gave the rest of the group a cryptic look and you let out a sigh.
You had a feeling there was something the rest of the group was hiding from you and you only hoped they would trust you enough soon, to be able to tell you what it was.
It was once again your last lesson of the day and you smiled at Boyd as you entered the classroom. You decided not to look at Isaac, as you couldn’t take another moment of his alluring stare.
It was only a few minutes into the class however, when you felt a sudden kick to your chair. You looked behind you and noticed Isaac's foot on the back of your seat. You turned back around and decided to ignore it. It wasn’t causing you too much of an issue and you weren’t feeling strong enough to face the new Isaac at the moment.
A few moments later you felt another kick, but you just rolled your eyes and carried on writing. However, after the fourth kick, you had had enough. You looked over your shoulder at Isaac, but he pretended not to notice and acted like he had done nothing wrong. You made eye contact with Boyd and rolled your eyes, causing him to chuckle. Isaac suddenly kicked your chair again, however this time he kicked it with some force and you were pushed harshly against your desk, bruising your ribs. You let out a grunt of pain and for a moment you were shocked that Isaac had hurt you.
However, your shock didn’t last long and you found yourself suddenly angry at his actions. You pushed your chair back with force, causing him to remove his foot from your chair and you twisted around ferociously, glaring daggers at him. For a moment he looked like the usual Isaac you had grown to like. You saw a flash of remorse and worry spread across his face and for a moment you thought he was going to apologise.
But then Boyd also turned to face Isaac protectively and you were glad to have him by your side as a trusted friend. Isaac looked towards Boyd and then back to you, a sadistic smirk slowly spreading across his face. He chuckled lightly and rolled his eyes at you, before leaning back in his chair and looking out of the window.
You had decided to sit with Boyd at lunch the next day, as you had plans to go over your history homework. You couldn’t help but glance over at the table where Isaac usually sat alone and were shocked to see him sitting beside a blonde girl. His arm draped casually over her shoulder. Did Isaac get himself a girlfriend?
You quickly looked away, not wanting to get caught staring. Especially after what went down between you two yesterday. However, Boyd had noticed you looking over at Isaac and even he seemed to be shocked at what he saw “Are Isaac and Erica dating now?!” He exclaimed.
Your eyes widened in shock “Wait, that’s Erica?!” You risked another glance over at them and quickly turned away. Both Isaac and Erica were staring in your direction, both of them smirking wildly.
You looked up at Boyd and noticed him still looking over at them. You grabbed a hold of his arm and yanked at him, causing him to look away “Why did you do that?” He asked.
You whispered harshly at him “Because you were staring! Do you want them to know we were talking about them?!”
Boyd whispered back “I don’t really care either way. And is that why you’re whispering?”
You rolled your eyes “Well I do! And yes obviously.”
Boyd began to laugh “Y/n, they’re sitting at the other end of the hall, I really doubt they can hear us.” He reasoned, no longer whispering.
You sat up straight and flipped back your hair “Yes, well... I guess you’re right.” Soon enough you were both laughing at your stupidity and you were glad for the distraction. You didn’t want to think about Isaac dating anyone else, even after how much of a jerk he was being.
Your laughter was interrupted not long after, when Scott and Stiles approached you both. “Hey Y/N, hey Boyd.” Stiles waved before sitting opposite you.
“Hey guys.” You respond “What can we do for you?”
Scott suddenly spoke up “Well actually we are here to receive the keys to the ice rink off Boyd.” He beamed at Boyd, clearly trying to charm him with a bright smile.
Boyd leaned forward “I told Stilinski it would be 50 dollars.”
Stiles moved forward to meet Boyd half way “I’m pretty sure you said it would be 20.” He slides 20 dollars across the table.
Boyd huffs and slides the notes back towards him “I said 50.” He was holding his ground. You watched the exchange with amusement.
“Okay, how about 30?” Stiles asks hopefully.
“50.” Boys responds.
Stiles sighs and gets out his wallet and counts his money “Look I’ve only got 40 and...” He searched around in his pockets and pulls out a chocolate bar “some chocolate?”
Boyd stays silent for a while, before taking a set of keys out of his pocket “Deal.” He trows the keys to Stiles and reaches for the money and chocolate bar.
“What are you guys doing at the ice rink?” You finally ask, breaking the silence.
Scott smiles at you, we are taking Allison and Lydia on a double date.” You smile back at him, before turning to Stiles, smirking slightly.
“Does Lydia know it’s a date?” You ask and he stumbles over his words.
“Not exactly, but hopefully she will realise half way through and will see it as the best date she’s ever had.” You can’t help but laugh at his optimism. “We were gonna ask if you wanted to come actually, but we thought it would be awkward if you didn’t have a date of your own...”
Scott chimed in “You’re still welcome to join us though... if you find a date.” Scott looks away sheepishly.
Stiles glances over at Isaac, who was now sitting alone “Why don’t you ask him?”
You can’t help but sigh “I probably would have, but not anymore. He’s become a real jerk and I don’t date bullies.” A sudden idea springs to mind “Hey Boyd?” Your friend turns away from counting his money from Stiles and looks at you. “Want to go on a date with me?” You ask.
Boyd lets out a laugh “Sure thing!” He exclaims excited.
Stiles lets out a low groan “Are you serious? We basically just paid him to go on a date with you!”
You and Boyd look at each other and laugh “Yeah I guess you did!” Scott and Stiles walk away in defeat “We will see you tonight!” You call after them still laughing. Boyd opens up the chocolate bar from Stiles and splits it in half, handing you a piece.
You accept it gratefully and begin eating contentedly, looking forward to your date tonight.
You picked Boyd up on your way to the Ice rink. You were meeting the rest of the gang there and you were glad that Boyd had agreed to come with you, as you wanted him to get to know your other friends and maybe even join the group himself.
Everyone else was already there when you arrived and you were impressed at Lydia’s ice skating abilities. Whilst she was spinning around on the ice like a professional ice skater, Scott was barely managing to stay upright and was grabbing hold of Allison for support. You turned to Boyd and held your hand out to him, “Care to take me on a tour of your work?” You ask and he gladly accepts your invitation. Soon enough you were both skating along the rink, laughing merrily.
After a few hours of skating around with everyone, your toes were beginning to get too cold, so you and Boyd decided to head home. You made your way out of the entrance of the ice rink and out into the car park, still laughing happily. You were glad Scott and Stiles had invited you out, needing the distraction to keep your mind off Isaac.
However, just before you reached your car. A black SUV pulled into the car park and skidded to a halt in front of you both. The driver door opened and a muscly, dark haired man got out. He began walking towards Boyd with purpose. You grabbed hold of Boyd's sleeve on instinct, slightly intimidated by the unknown man. The passenger door and one of the back doors of the car then opened and to your surprise Erica, followed by Isaac got out of the car and stood beside the dark haired man.
You couldn’t help but stare at Isaac, but after glancing in your direction once, he didn’t even look at you again. Erica, however, was smirking at you. Her full focus drawn in your direction. You glared back at her, not wanting her to think she managed to get under your skin. After a moment, you turned your attention back to the mysterious male.
He walked forward slowly “Hi Boyd, my name is Derek Hale. Is it okay if we can talk? Isaac here has told me all about you.” He gestures towards Isaac and smiles at Boyd.
You were surprised at Derek's words, why was Isaac talking to this man about Boyd?
“Erm... sure.” Boyd replies, before turning to me “Are you okay to wait here for a minute whilst we talk?”
You nod at him and look back towards Derek, who is finally acknowledging your presence “Actually, this may take a while. I can drop Boyd home, so you can go on ahead. We wouldn’t want you to stay out too late.” He smiles at you, clearly trying to be friendly. But for some unknown reason, it causes a tingle down your spine.
“I don’t mind waiting.” You say, not wanting to leave Boyd alone “I can just wait in the car if it's private-” You were about to continue when Isaac suddenly cut you off.
“Y/N. Just go home. This is none of your business.” He was so abrupt with you, that it caused a pain in your chest. He didn’t even bother to face you, but instead turned his head to the side away from you and crossed his arms in annoyance.
“Oh.. okay.” You say quietly and Erica lets out a laugh, but you decided to ignore her and instead turn to face Boyd “Are you sure you’re okay? You don’t have to stay you know.”
He smiles down at you “I’m sure it will be fine. I will just hear what they have to say.”
You smile back at him and let go of his sleeve “Okay then, but text me when you’re home?” He nods in response and you turn back towards your car. You risk one last glance at Isaac and the others, but he refuses to look at you.
“It was nice to meet you Y/N.” Derek calls after you and you smile back at him.
“Don’t worry we won’t keep your boyfriend long!” Erica calls after you, but you carry on walking to your car. Not caring enough to respond.
You received a text from Boyd an hour later, saying he had gotten home safe. You sighed in relief, and finally allow yourself to drift off to sleep.
You had planned to ask Boyd about what had happened at school the next day, but he never showed. You dropped him a text during first period in case he was just running late, but he didn’t respond.
“You know, if you keep frowning like that you’ll get wrinkles.”
You jumped at the sudden voice beside you and glance down to see Isaac with his head on the desk, facing towards you. He had been sleeping through most of the class, so you were surprised to hear him speak.
You let out a sigh and face the board, ignoring Isaac.
“Hey, don’t ignore me.” Isaac sat up suddenly, but you continued with your work.
He let out a light chuckle “You know it’s rude to ignore people...”
You quickly cut him off “If you know it’s rude to ignore people, then why did you ignore me last night?” You instantly cursed yourself for responding. He was clearly looking for a reaction and you had given him one.
He smiled darkly at you “Is that what you’re mad about? If you want me to give you attention, all you have to do is ask.” He places his hand under the desk and reaches over to put his hand on your knee.
You are frozen in place. He edges towards you, his hand slowly moving up your thigh. Your heart began to beat out of control. A range of emotions washed over you. Panic. Pleasure. Anger. Lust. You finally got your thoughts into place, just before he reached a certain private spot. You reached under the table and grabbed his hand and thrust it away from you with as much force as you could muster.
You then stood up abruptly and smacked Isaac hard across the face. The sound echoed throughout the whole class room and everyone turned to face you in shock.
Mr Harris rounded on you in an instant “Miss Y/L/N! Make your way to the headteachers office this instant!” You were about to argue, when you were cut off “And Mr Lahey, you will come see me after class. Now go.”
You picked up your stuff off of the desk and threw it into your bag, before glaring down at Isaac, who was still sitting there stunned. You then stormed out of the classroom, not bothering to look back.
Luckily you weren’t in trouble with the headteacher, after explaining what had happened. And even more surprisingly, you found yourself defending Isaac so he wouldn’t get expelled. His punishment would be a week of detention instead.
After skipping your next class, you decided to study on the bleachers. The weather was nice, and you thought a Vitamin D boost would help. You had managed to get most of your homework done and you were glad to keep yourself distracted. Your mind had been whirling with thoughts of Isaac and also worry for your friend Boyd, who had yet to text you back.
You decided to try calling Boyd, but it went straight to answer phone. You let out a heavy sigh and looked out across the field. A group of boys began sprinting across the field in their jerseys. You had completely forgotten that today they had practice for Lacrosse. Which meant the whole team, including Isaac, would be on the field. You began to pack up your homework, not wanting to bump into him, but someone called out to you, stopping you in your tracks.
“Hey Y/N!” You were glad to see Scott and Isaac coming towards you. “We heard about what happened in class, are you okay?!” Stiles asked, looking genuinely concerned.
You smiled at him, glad that you had good friends you could rely on “Yeah, I’m fine. Just an issue involving a certain someone getting a little handsy.” You nodded towards Isaac who had just made his way onto the field and was clearly trying his hardest not to look in your direction.
This time Scott spoke up “Wait, he put his hands on you?!” He was beginning to look mad and you smiled at him, trying to show him that you were okay.
“I’m fine, he only touched my leg. I stopped him before he could do anything worse.” You let out a sigh “Anyway, you guys have practice, so I’m going to go. Good luck to you both!” You patted them both on the shoulders and went to stand up.
Suddenly there were police officers on the field, being led by Stiles’s dad, the Sheriff. “I wonder what’s going on?” You say out loud.
“I don’t know.” Stiles admits.
You watched from the bleachers as Stiles’ dad approached Isaac. Suddenly Isaac was being escorted away, a shocked look on his face.
“Why are they taking Isaac?” You ask, slightly panicked.
“Because his dad was murdered.” Scott answers “And they think he’s a suspect.”