A/N: This drabble is from the "Send me a pairing and a line of dialogue and I'll write you something angsty" meme on Tumblr (I'm "scapeartist" there too, if you care to follow me). The line I needed to include was: "Don't trust me," and the pairing was Captain Swan.
Emma had been searching for Killian throughout the crumbling and smoking castle, dodging and knocking out guards and fearing the worst. Morgana had been after them both when they spilt up — Killian to take cover before flanking the sorceress and taking her down with the magical weapon Merlin promised would defeat her, and Emma to confront and distract with her own magic in a classic bait-and-switch maneuver. But when Emma turned to take on Morgana, neither she nor Killian were anywhere in sight. Terrified, Emma raced around calling for him, disregarding her own safety to confirm his.
Every second she couldn't find him was one too many. Making her way to the great hall where the standards and banners of Arthur had been shredded and set ablaze, Emma scoured the room, looking behind tattered curtains, overturned tables, cracked and dismembered statues. If there was a panic button to hit, she would have broken it a while ago because now she was outright frantic. She shouted for Killian again and again, her voice rough and on the edge of a frustrated sob.
"Oh, God, Killian…where the fuck are you?!" she said to herself, moving out into the corridor again, sword and magic at the ready. Movement several meters away off to the right caught her eye, and a figure slowly rose up from behind a stone bench that had been split in half. The black coat and dust-streaked disheveled hair gave her pause until bright blue eyes met hers and she rushed over, tossing down her sword and throwing her arms around Killian's neck as she peppered him with kisses, ignoring the soot and dust sprinkled over each of their noses and cheeks.
"Oof!" he grunted, wrapping his arms around Emma and holding her tightly.
"I thought I'd lost you…" she said between each peck and caress, her fingers anchored in his hair with no intention of letting him go even if a dragon busted through the ceiling, fire pluming from its fucking mouth. All she could do was be grateful she found him in one piece, and she'd be damned if she was ever letting him out of her sight again.
"Never, love. Never," he said kissing her back soundly, his hook twirling a lock of her hair.
Grasping the side of her head with his hand to stop her ministrations, Killian leaned in to nuzzle her ear. Barely moving his lips, she heard him whisper, "Emma. Don't trust me. My heart belongs to another…"
Stilled in confusion and horror at his admission, Emma leaned back to look into Killian's eyes, searching. Her hand slowly slid down his chest where she pushed it in and found nothing. His heart was gone. She pulled her hand away causing Killian to clench his eyes shut at the disturbance to his body for the second time in less than half an hour. "Sorry, love," he said quietly, the fear in his eyes conveying everything to her.
Emma backed away just as Killian doubled over, clutching his chest where her hand had been. He held up his own to keep Emma at bay even though she started toward him to catch him. "No, Emma!" he gasped.
Laughter echoed off the walls of the castle, booming and maniacal. The sorceress Morgana appeared behind Killian, his heart pulsing strongly in her hand as she held it out for Emma to see. She gave it a firm squeeze that sent Killian to his knees in agony, and tears of helplessness coursing down Emma's face.
"I think it's time we got to know one another, don't you, Savior?" Morgana asked icily, with a devious glint in her eye. Then, in a swirl of robes and wild hair, she turned to exit the castle, with a commanding, "Come, slave. Bring her too."