I've seen this mentioned a couple of times, and the thought wouldn't leave me alone. I am in love with everything about the finale, and it's going to be a looong summer until we get more CaptainSwan love and adventures! This is going to be a place for CS one-shots, I would love any feedback you can give me!

Disclaimer: Obviously not mine. I couldn't have come up with the perfection that was Killian and Emma last night. Just sayin'.

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Role Reversal

Regina stormed out of the diner, leaving Emma to stare after her in devastated shock. Killian had warned her about saving this woman, about bringing her to the future. He couldn't have been more right; she had destroyed so much because she wanted to play hero. After everything Regina had overcome, after how much she had grown, what she wanted so much was ripped away from her. And it was all her fault.

The blonde felt her chest tighten and her eyes burn with tears. Her breathing became short and harsh, and Emma's vision tunneled. After everything, she had ruined Regina's happy ending. With a sharp exhale, she stumbled backwards, ready to flee into the back of the bed and breakfast-

Until she stepped back into a warm, solid wall. Killian's hand fell gently onto her shoulder, but she smoothly spun out of his grasp, past her worried parents, and into the inn hallway. Once she was alone, she fell back against the wall and dragged her hands through her hair. She was supposed to be the frickin' Savior, not destroyer. She'd watched her mother's guilt over her role in Daniel's death eat at her long enough to recognize that she must've felt the same way.

Emma tried to put herself into Regina's shoes, to imagine how the other woman must be feeling. After so much pain, so long seeking vengeance, she'd finally overcome her darkness and found a man who could give her a second chance. Robin was one person who could truly understand and accept her for all of her flaws and strengths. After all, Robin had also lost a love once…well, thought he'd lost. Out of the blue, this woman, his first love, walked right back in as if no time had passed. Emma couldn't imagine…

And then, with terrifying clarity, she could. Like a punch in the gut, Emma felt all of those fears that had kept her from letting Killian in rushing back, as she pictured Killian's face if that had been his Milah walking back into his life. Her legs suddenly couldn't seem to hold her anymore, and she slid down the wall with a shuddering exhale.

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Killian turned and watched Emma rush out of the diner, and then raised an eyebrow at her parents. Out of the corner of his eye, he noticed Robin hurry out the door after Regina. David started to go after her, but Mary Margaret grabbed his arm. Killian sent her a grateful half-smile, ruffled Henry's hair as he walked by, and nodded reassuringly to David. If only he felt as reassured as he appeared. After everything they'd been through, Killian couldn't lie to himself and pretend that he didn't have any lingering fear that she would shut him out again. Alas, his beloved was in pain, and he would not leave her to suffer alone.

When his eyes fell on her, Killian's heart ached. She was crouched against the wall, hear forehead pressed against her knees. Her body was trembling visibly, and her hands were clenched tightly into fists.

"Your family is worried after your hasty exit, love," he murmured, slowly making his way to her as if she were an injured animal. When she looked up at him with tears running down her face and fear in her eyes, he closed the distance between them and dropped to his knees in front of her. "What is it, Swan? This is more than guilt," he murmured, lifting her chin gently to draw her gaze.

"This is my fault…you warned me, Killian…Regina won't ever forgive me. She's going to go darkside again because of this."

Killian shook his head. "You were acting with the best intentions, darling. You had no way to know who she would be. And you don't know that she and Robin are through. He left his boy with Marian and followed her."

Emma's eyes widened for a fraction of a second, before her expression became guarded. "But Marian is the mother of his child…his first love." The uncharacteristic fear and uneasiness in her eyes tore at his heart, but he knew that she needed to voice her concerns to him in her own time. "W-what…what would you do if our roles were reversed? If it had been Milah to suddenly show up alive, especially considering we now know time travel can be done?"

Killian's eyes clenched and he drew a slow breath. There it is. "Emma…"

A single tear slid down her face. "You can't tell me you wouldn't feel anything, Killian," she murmured sadly.

A tender smile crossed the pirate's face, and he watched confusion fill her eyes. Hook's hand slid up to cradle her jaw, and he captured her lips in a searing kiss, drawing a gasp against his mouth. He felt Emma tense, and tilted his head with a slow stroke of his tongue across her own. Slowly, she melted against him, her fingers curling into the lapels of his coat. He slid his hooked arm around her back, and tugged her to her feet. Once they were upright, Killian backed Emma against the wall once more, this time using his hips to keep her in place.

He felt her gasp again, but the way her fingers slid to his neck as she grew more insistent. Before they got out of hand, particularly considering her family could follow him at any moment, he pulled away and rested his forehead against hers to catch his breath.

"Of course I would feel something. She was my first love, after all. But Swan, would you go back to Bae if he returned? And let's face it, love, the chance of that is considerably higher than Milah ever coming back."

Emma stared into his eyes for a long moment, and he watched the understanding dawn in her green depths. "Of course not, Killian. Aside from the fact that he left me, I could never turn my back on you. Not after everything we've been through."

Hook smiled affectionately, and stepped back just enough to give her space from the wall. When she followed him anyway, his heart swelled and he felt himself falling for her even harder than he'd thought possible. He didn't care what it took, he would never give up proving to her just how much he cherished her. "And what makes you think my love for you is any different? Don't forget, Swan, I knew this long before you warmed up to me."

Emma gave him a teary laugh, and then pulled him down for another chaste kiss. He ran his fingers through her hair, relishing in the fact that he could kiss her and hold her whenever he chose. "Love, as much as I would love to continue this right now, your family will be expecting us back at the party. I reckon your father will not appreciate my not returning with you, considering they haven't been informed of, well…us."

Emma nodded with a smile, and reached down to intertwine their fingers. "Let's remedy that, shall we?"