Disclaimer: I do not own Arrow or anything to do with DC. I do not make any money from the writing of this story.
*****
Sara Lance loved her new life on the Waverider, especially now the crew was feeling more and more like a family instead of a collection of expendable heroes, but she would always be there for her original superhero family in Team Arrow. Going back to see them had become a regular occurrence, but this was the first time the message had told her to go to Thea's apartment alone.
That was strange, but Sara shrugged it off. Then when she actually got there she found the door unlocked, putting her on edge as she sneaked in, ready to do battle if necessary. Of course this was her now dead sister's apartment originally, and she did recently envisioned herself sitting on the couch talking to Laurel when she touched that weird staff thingy. Which was why she thought she was seeing things when she turned the corner to find Laurel waiting for her.
After trying to blink away the illusion and failings Sara choked out, "Laurel?"
"Hi Sara." Black Siren said as softly and sweetly as she could.
"Laurel!" Sara exclaimed, running up to her and throwing her arms around her, then after a few long seconds whispering against her sister's neck, "How is this possible?"
She had been trained better than this, knew that she shouldn't just trust everything she saw, but at that moment everything else was forgotten as Sara's overwhelming happiness of seeing Laurel alive again. And the next few seconds were blissfully happy as she got to enjoy that feeling, but then Laurel grinned wickedly, maybe more wickedly then Sara had ever seen before and she wrapped her arms around her and began sliding her hands down her back.
It was enough for Sara to start asking the important questions, and while she started with the most obvious one her mind was racing for explanation, and all the possibilities, and finally realised it was increasingly likely she had just wandered into a trap. Then her eyes went wide as Laurel's hands slid all the way down to her ass and squeezed it.
"And why are your hands on my ass?" Sara squeaked, but noticeably didn't pull away.
"Because you have a truly amazing ass, in any universe." Black Siren said softly against Sara's ear.
"Any universe?" Sara questioned.
"I'm from Earth 2." Black Siren explained, pulling back so she could look into Sara's eyes and for once bear her soul, "An alternative universe, in which you and Dad died, not me. I got to live while everyone died, until there was nothing left for me there."
It took Sara a few long seconds to process this, then she softly told her sister's mirror image, "I'm sorry."
"Don't be." Black Siren grinned, squeezing Sara's ass again, "I'm close to getting back everything I lost."
Raising an eyebrow Sara questioned, "Oh... we, we weren't sisters in your world?"
"We were." Black Siren confessed with a wicked grin, "But just before she died my slutty little sister got super drunk one night and made a move on me, which sent me down a very, very dark path."
"Oh." Sara blushed, before repeating, "Sorry..."
"Why? Technically it wasn't you." Black Siren pointed out, before grinning wickedly again, "Or did you do it here in this world too?"
"No." Sara said quickly.
"Did you want too?" Black Siren questioned, and then when there was a telling silence she grinned again, "Well, now here's your chance, and you don't even have to get drunk for it."
There was a brief pause and then Sara mumbled, mostly to herself, "You're not my Laurel."
"No..." Black Siren agreed, slowly leaning in, "But I'm close enough."
With that her big sister kissed her in the way Sara had always wanted her too. Not on the cheek or the forehead, and certainly not only for a few seconds. No, she pressed her lips to hers and kept them there until Sara responded, something that initially the White Canary tried to prevent herself from doing, but she just couldn't help it.
She knew this was wrong, not simply because they were sisters, but because it was a betrayal of Laurel's memory. Especially in the last place Laurel had called home. But this wasn't Laurel, or at least not her Laurel. It was someone with her voice and face, and in that moment it was impossible to tell the difference, but Sara soothed herself with the knowledge that technically it wasn't her, because honestly she just couldn't hold back. Not entirely, as she just wanted it so badly.
So much so that to her shame Sara began kissing her sister's doppelgΓ€nger back, closing her eyes and melting into the kiss so she could forget just who this was. Which was kind of easy, because whoever this was they were far bolder than she could have ever imagined Laurel being. And not just with her lips.
No, this Laurel kept one hand firmly on Sara's ass the entire time, shamelessly groping and squeezing it, while the other slid upwards to do the same to her boobs. And she was the first to push her tongue into the other's mouth. And finally, when she pulled back this version of Laurel had the kind of wicked grin on her face which Sara didn't even think that her sister had been capable of.
"Yeah, that's what I thought." Black Siren grinned wickedly.
"God this is so wrong." Sara practically growled with desire.
"You love it." Black Siren accused.
"I do. I really, really do." Sara confessed, a smile crossing her face, "You're not my sister, but you're close enough for me to wanna fuck you."
"Oh, and I thought Felicity was easy." Black Siren chuckled wickedly.
"You fucked Felicity? Felicity Smoak? Who's been practically married to Oliver for years?" Sara questioned in disbelief, before grinning wickedly, "Wow, impressive."
"You haven't seen anything yet." Black Siren promised, and then when Sara just raised an eyebrow she told her, "Follow me."
Black Siren was delighted when the mirror image of her sister obeyed without hesitation. She seemed to be carefully watching for traps, which was very impressive, and proved that Sara Lance was everything her little friends had said she was, but Black Siren highly doubted that The White Canary couldn't have anticipated the trap that was waiting for her.
Sure enough Sara couldn't hide her surprise from her face when Black Siren led her into the bedroom to find Felicity, Thea and Dinah all on their knees, their gazes down, wearing nothing but black collars tied firmly around their necks. Black Siren took a few long seconds to admire her handiwork, and then turned to her latest victim and gave her another wicked grin.
"As you can see, I didn't just fuck Felicity, I made her my little fuck toy. Just like I did Oli's baby sister, and this wannabe Canary. Just like I'm about to do to another wannabe Canary right now." Black Siren boasted.
"Oh really?" Sara smirked.
"Really." Black Siren confirmed, before further explaining, "So here is what's going to happen. You're going to get down on your knees and eat my pussy just the way you always dreamt of doing to your big sister, you filthy pervert. But then? Mmmmmmm, then I'm going to take my reward. Bend you over and fuck you up the ass until you're begging to be my bitch. Of course, I thought I'd have to kick your ass before I fucked it."
"No need." Sara reassured, slowly closing the distance between them, "And it sounds like a good plan. Really, I love that plan. Just one tiny detail needs to be changed."
"That being?" Black Siren raised an eyebrow.