Hi, I wanted to write something related with Emma as the new Dark One, so this is just what I came up with. I hope you enjoy it.
Regular story line
The night sky is calm after the darkness took Emma, but the loss sets a heavy toll on everyone. Mary Margaret buries her head in David's shoulder trying to see if this is just an awful dream, but it wasn't. David tries to hold back his tears as he tries to console his wife, but it seems futile when you lose your child again. Robin hold Regina close to him, but it isn't enough to cure her shock. Emma wanted to give Regina what she wanted, a happy ending, but at what cost? All Regina can think of is how Henry going to absorb this news.
Regina looks at Hook, even though he the light surrounding him is weak, you can see he is again hurt. Hook stares blankly at the dagger with shock, it doesn't seem real like the alternative reality. But the pain he feels in his heart feels real, which means this is real. Hook walks closer to the dagger and sees the one thing that proves to him that this is real, the name of the woman he loves etched on the steel dagger. Mary Margaret lifts her head from David's shoulder then nudges him to go to Hook.
David walks slowly as he is trying to convince himself that this is a dream, but his daughter's name on the dagger proves this this indeed a twisted reality. David places his hand on Hook's shoulder then gives him a reassuring squeeze.
"We'll get her back, alright?" David whispers as Hook looks at him with his piercing blue eyes.
"I never got to tell." Hook mutters and David bites his lip. Hook bends down and grabs the dagger. The dagger feels foreign to him as if it does not belong in his hands. The etched name feels like a hot piece of coal.
"She won't be the Emma you know." Regina shouts and Hook looks at her.
"It doesn't matter, it'll be better to have her here with the dagger in our possession than her out there alone." Hook replies
"Dark One I summon thee." Hook says with a hint worry
"I knew it would be you." A familiar voice says as Hook turns around to see Emma.
Emma looks the same, but there is something that doesn't click. Her voice didn't sound sweet, but more menacingly. Her eyes look darker than her before as if all the light that was there was sucked out. She looks like Emma as she walks closer to Hook then caresses his cheek, but it doesn't feel like Emma.
"Swan." Hook mutters but Emma shakes her head
"Think again, love." Emma laughs as she sees Hook with a distraught face.
"Don't be sad, dearie, I feel so much better. It's like I can finally be myself." Emma says as she turns to her parents.
"Hurts doesn't it? The sweet savior taken over by darkness and all the trouble you caused to make that happen. Great job, mom and dad." Emma says as she claps her hand. Then she turns her attention to Hook.
"How does it feel that all this time you wanted to kill the dark one and cure your blood lust, but now you fancy the dark one, how ironic?" Emma teases and Hook shakes his head.
"This isn't you. You are the savior, we will figure this out." Hook says as he tries to grab Emma's hand but he retracts it.
"Correction, I was the savior." Emma retorts as Hook is taken aback.
"So you have the dagger and now you have me, what does the dashing captain want?" Emma sings and Hook stays quiet.
"What cat got your tongue?" Emma says then makes a flick of her wrist. Hook tries to speak, but nothing comes out.
"Mom?" A familiar voice breaks out as Emma turns around to see her son standing outside of Granny's diner. His face shows confusion and sadness, for a moment, Emma stands speechless but she snaps out of it.
"Hey, kid, come over!" Emma shouts. Henry looks at her skeptically as he walks towards Regina, she pulls Henry closer to her and Robin.
"Oh, you don't trust me?" Emma says and Henry looks her deep in her eyes.
"Mom, this isn't you." Henry says and Emma smiles
"Sweetie, this is what your grandparents wanted to stop, but you can't stop faith, right?" Emma ask and Henry stay quiet.
"At least you have your happy ending." Emma says to Regina and walks towards Hook. She flicks her wrist again.
"I command you to do no harm, Dark one." Hook utters
"As you wish." Emma says. Hook walks over to Mary Margaret and David then hands them the dagger.
"Are you sure?" Mary Margaret ask
"She's your daughter, maybe you can bring back the light she has hidden in there." Hook says
"You still have faith in me? That's lovely, Killian." Emma says as Killian walks over to her.
"You still have light somewhere in this new form, but trust me, I will bring it out again." Killian whispers and Emma looks at him with her dark eyes.
"You still believe I'm pure?" Emma ask
"Somewhere inside you there is the Emma I know and…." Hook says but withholds the last words because it wouldn't feel the same knowing that the woman staring at him is Emma, but it won't feel real to him.
"And what?" Emma teases and Hook looks at her with sad eyes
"Nothing." Hook says as he starts to walks away.
Even though she is the Dark One, Emma feels a bit of pain inside her heart. As she walks towards her parents, inside her body two opposite forces fight an ever ending war between the small amount of light she possesses and the darkness she obtained. As she looks at Henry with Regina, Emma feels an acute pain inside. The savior is still inside, but she is bind with the overwhelming darkness flooding her heart and soul.