A/N: So I took the general plot line of this prompt, but I changed a few things.

Elsa freezes Regina's heart slowly. She hides it, in the end it's down to robin to kiss her and save her (Marion's NOT happy) but robin's reaction makes her realize he loves Regina :)

a frozen heart - 805 words

Regina could feel her insides freezing from the moment Elsa had shot that cold blast of wind at her. It was slow at first, just a simple chill, but after a week, her body had begun to feel like it was made of ice. She hadn't told anyone about it, but that didn't matter. Either way, she needed to push through it, if only just for this final battle. She needed to help the heroes contain Elsa, and the only way that was going to happen was if Regina, Rumplestiltskin and Emma worked together to control the Ice Witch.

But apparently, Elsa's magic had other plans for her.

Her finger tips had started to coat in small icy snowflakes, the tips of her hair going white.

"Regina," Emma shouted, the wind howling around the group of heroes as they stood in front of the library, where Elsa had taken up residence. "Are you ready?"

"Let's go," she replied, and with that, Charming, Rumple, Hook, Robin, Emma and Regina bound through the double doors.

The inside of the library was freezing, coated in snow and icy decorations. The group spotted Elsa behind a bookshelf.

"I thought I told you to leave me be!" Elsa shouted, "I can't control this curse!" With that, a blast of ice shot out from where she was sitting, almost nailing Charming to the wall. Regina could hear Elsa's breath starting to quicken as she whisked herself up in a cloud of bluish-white smoke. As if on cue, the floor began to chill.

"She's downstairs," Rumple said, "Her ice is hitting the ceiling." Rumple transported himself and Charming downstairs with his own magic, and Emma grabbed Hook's shoulder and followed suit.

"Well," Robin said, inching closer to Regina, "Shall we?"

All of a sudden, Regina's magic engulfed her and Robin, sending them swirling down into Maleficent's former home.

When they had all reached the basement, the first thing Regina noticed was her hands, now totally covered in this icy sheen, and it seemed to be spreading quickly up her arms.

"Regina," Robin whispered, "your hair… It's turning white." Suddenly, Regina collapsed, a sharp stabbing pain reaching her head and heart, and she shrieked and collapsed over. Robin caught her in his arms as she fell. Rumple rushed over to the two and grabbed Regina's hand. Rumple sighed, knowing exactly what was wrong.

"She froze your heart, didn't she?" Rumple asked.

"A frozen heart?" Robin asked, concern covering his face as Regina was getting colder in his arms. "How can we fix it?"

"Don't you see?" Rumple replied, "That's why I kept the queen bottled up. She did this to her sister years ago, and we couldn't undo it. She froze and became an ice statue, and after Elsa was bottled, whatever was keeping her in that state disappeared. She melted."

"It doesn't matter," Regina whispered, pushing herself out of Robin's arms and took a few shaky steps forward, "we have to keep moving. We have to stop her, no matter the-"

"You all need to go!" a voice shouted, and Regina looked up to see Elsa, still sporting her blue sparkly dress, standing not far from them.

"Elsa," Regina shouted weakly, she could feel the ice inside her rising to her cheeks, "you need to stop pushing people away!"

"That's the problem," the blonde shouted back, "every time I get close to someone, I hurt them. I just can't."

"Yes you can, Elsa!"

"NO, I CAN'T!" With that, the blonde whipped around shooting out an array of ice daggers. Regina noticed one headed straight for Robin's heart, and with that, she jumped in front of him, blocking it with her own, as the cold shot into her chest once again, spreading until she couldn't move.

A piece of solid ice.

"Regina," Robin whispered, as Elsa swirled away in a blast of snow. He reached up, and placed his hand on her warm cheek. A single tear ran down his cheek as he reached up to kiss her gently on her forehead. "I'm sorry," he said as he pressed his lips to the ice.

All of a sudden there was a blast of white light. The ice statue that was Regina was getting warmer. Robin jumped back, scared of what was happening, but when he saw her black hair come back, her skin return to its natural shade, he let out a sigh of relief.

"True love's kiss can break any curse," Emma whispered.

It was then that Robin realized, after losing both Regina and Marion, that he knew which woman he belonged with.

He belonged with the woman who had given him a second chance, the one who looked past all of the baggage, the woman who had some herself.

The woman who had just been frozen solid to save him.