This is based on a prompt from iloveyourintimate on Tumblr. It's rather detailed and I don't want to give the whole plot away by quoting it here, but here's the gist: "AU Felicity and Megan were born absolute twins and even their mother doesn't distinguish them sometimes. They are both very beautiful and way too smart and equally babble all the time. The only thing Felicity doesn't know is that her beloved twin sister hates her since finishing school because of some boy who fell in love with Felicity, not with Megan." Eventually, they meet Oliver and Tommy. And then, well, you'll just have to wait and see...
Felicity and Megan Smoak were born within two minutes of each other, but Felicity was born first and Megan felt like she had been playing catch-up ever since.
Though both sisters remained nearly identical physically even into adulthood–so much so that their mother dressed them in completely different wardrobes to keep them straight–their personalities couldn't have been more different. Where as an infant, Megan cried constantly and caused their mother to stay awake for hours each night trying to calm her, Felicity rarely made much of a fuss. That remained true as they grew. Felicity was a model student while Megan let her grades slip almost in defiance of her mother's pride over her sister's accomplishments. She was often called into the principal's office for truancy or some other infraction. Like the time she got suspended for getting caught kissing some boy behind the gym building when she should have been running around inside it.
By the time high school rolled around, few people mistook one sister for the other—not only because their mother's clothing conventions had translated into two girls with very different fashion senses. Megan had long ago switched to contacts and styled herself in edgier, less colorful looks than her almost obnoxiously sunny sister. Neither girl was terribly popular, yet each had their own sets of friends. Felicity was a quintessential nerd: smartest student in their year, spent her time outside the classroom tutoring fellow students, obsessed over anything with a hard drive and was prone to awkward rambling that reflected how fast her mind could move and baffled the uninitiated (the primary reason she was a valued if non-speaking member of the debate team. Megan was just on the edge of popular and decidedly rebellious: frequently spent her nights at parties thrown by listless friends long out of school, wasted more than one day breaking into unused homes to watch whatever boy she was currently dating skateboard in empty pools, picked up their mother's long held smoking habit despite her nagging, spent her spare time writing angsty poetry to brooding music and was prone to babbling that seemed less uncontrolled word vomit and more a semi-studied frankness that seemed a deliberate attempt to make others uncomfortable.
Still, despite their differences and their mother's maddening habit of comparing the two (typically in Felicity's favor), the relationship between the girls had never been particularly hostile—not that it had been particularly chummy either. Felicity and Megan were like any other sisters. They had their minor spats, but their relationship was mostly a live-and-let-live situation. The rift came thanks to one Jake Porter.
Unlike Felicity, Megan seemed almost allergic to any structure, especially if it involved school. Her one mother-accepted activity, however, was her involvement in their school's drama club. She loved the escapism of being someone else and was content to dance in the background even as she wished to be the in the spotlight. She never scored the lead in any of her high school plays, not of her own merit at least. But in their senior year, she lucked out when the girl meant to play Juliet to Jake's Romeo became ill and had to drop out. Megan, who was meant to play the much smaller though not insignificant role of Lady Capulet, was promoted to the lead and very quickly realized that she didn't need to do much acting. She was already enamored with her costar.
Though Megan and Jake hadn't had much cause to trade lines during rehearsals, offstage was a different story. He had, at first, mistaken her for Felicity, but once she corrected him, they became fast friends. They bonded over their hatred of Mrs. Bryant's Calculus class and a shared love of theater and performance during the tedious downtime that was an inevitable part of putting on a high school play.
Jake was not the kind of boy Megan usually went for. Well-behaved, a competent though unremarkable member of the track team and a good student only a few places below Felicity in the class standings—he was practically the antithesis of her former paramours. Yet that was precisely why she liked him. She had, unfortunately, inherited her mother's propensity for unreliable men and she liked Jake precisely because she knew he was trustworthy. She had chalked up the sparks she felt whenever they kissed while playing Shakespeare's star-crossed lovers as just part of their characters, but when the play ended just a few weeks before homecoming, she hoped that chemistry might translate into an invitation to the dance.
Which was why, when Felicity had beamed as she told her and their mother over dinner about being asked to the dance, Megan had been completely surprised.
"That's wonderful, honey. Who is he?" their mother had asked, leaning forward in interest.
"Jake Porter," Felicity had answered proudly.
"What?!" Megan had exclaimed at the same moment their mother had gasped and clapped with delight.
"Oh, he's dreamy," their mother had sighed. "He was your Romeo wasn't he, Megan."
"Yeah, Mom," she had said and waved a hand at her, as if shooing away a fly. She leaned forward across the table toward her sister and tried to ignore the feeling of bile rising in her throat. "How do you two even know each other," she had asked, struggling to keep her voice from betraying how upset she was.
"We're in English and History together," Felicity had explained. "We've actually been in a lot of classes together since freshman year."
"Oh, Felicity, I'm so happy for you," their mother had said and stood to hug her. "Maybe if your sister went to class, she would have a date too," she had added and eyed Megan, who was already too hurt to notice.
"Mom!" Felicity had exclaimed, "don't say that. I'm sure Megan will find someone to go with if she really wants to."
She, of course, hadn't and instead spent the remaining weeks growing more bitter as Felicity and Jake started dating and she was dragged along to endless fittings so their mother could find Felicity the perfect dress. She had, as an afterthought, offered to buy Megan a dress too, but by then, she had lost any desire she had once had to go.
Megan's long-simmering though unrealized resentment toward Felicity had come into full bloom then and steadily grew throughout the rest of the school year. Even the breakup between her sister and the former boy of her dreams–a "mature" decision they both made because of the distance college would put between them–gave her little comfort because it was so amicable. By the time her sister departed for MIT and she was preparing to start at UNLV in the fall, Megan was perfectly content with the prospect of never seeing her sister again. She succeeded in avoiding her over most of their college years, only meeting during the holidays when they were both home to visit their lonely mother.
Things became even easier after they graduated as Felicity moved to far off Starling City and Megan toiled away trying to find work as an actress or dancer in Las Vegas's numerous shows. She finally found mild success as part of the ensemble in a Broadway show touring through the city and followed it right out of Las Vegas to its final stop in Starling City. Instead of returning home, Megan decided to try her luck in the city's burgeoning theater scene and reluctantly asked her sister if she could live with her temporarily until she could afford her own place.
Felicity had welcomed her with open arms and told Megan to stay as long as needed or even to move in permanently if she wanted. With the optimism and bright-eyed obliviousness of someone for whom nothing has ever really gone wrong, Felicity had never noticed her sister's change in attitude and the fact irked Megan more than open hostility would have. Still, her sister's enthusiasm was infectious and without the toxic influence of their mother, Megan decided to try to repair their relationship—if only to make living together easier.
But then they met Oliver Queen.
Thanks for reading and please leave some feedback. While Megan is technically supposed to be the villain of this piece, I can't guarantee you won't grow to root for her a bit. I have always loved femme fatales.