The second time she did it was shortly after they defeated Zelena.
Emma and Killian were sitting at a booth in the diner with Henry, sharing cocoa and eating fries.
"Want to see something impressive, Henry?"
Henry nodded.
Emma waved her hand and suddenly Killian's hook disappeared from his brace and reappeared hanging from a light fixture.
"Cool!" said Henry with glee.
Killian smiled indulgently before retrieving his hook and clicking it back in to place. Then he leaned in and kissed Emma tenderly, not even caring that Henry was sitting right there.
"Gross," said Henry.
"What was that for?" asked Emma, when he pulled away.
Killian just gripped her hand and took another fry.
-/-
They were at the loft a couple of days later, baking cookies for Henry to take to school.
Emma couldn't find the dough hook. She grinned and waved her hand.
"Oi!" exclaimed Killian from across the kitchen.
Emma gripped his hook and wandered over to the mixing bowl, using it to stir the mixture into a thick dough.
Killian came over and wrapped his arms around her, kissing her lightly.
Emma smiled and washed the hook in the sink before giving it back to him.
-/-
Henry and Killian were sailing when it happened again.
Killian gestured out over the water with his hook, only to find it missing seconds later.
Killian stared at his hookless brace, knowing that somehow Emma was responsible. She was supposed to be at the Sheriff's station today, but then again, her magic had been growing more powerful with each passing day.
"What do you say to calling it a day, lad. I have to pay a visit to your mother."
Henry nodded. "She's getting good at that isn't she?"
"Aye lad," said Killian, "She is."
He found her at the station thirty minutes later. His hook was lying on her desk.
"Bad form, lass," he said with a teasing smile.
Emma looked up at him with feigned innocence. "Missing something Captain?"
"Yes," said Killian, before coming behind the desk, taking Emma into his arms and kissing her soundly.
-/-
This time he was at the Rabbit Hole with David and Robin. "Another round for my mates, barkeep," said Killian.
They'd been there for an hour and were already pleasantly buzzed.
"Jones," said Robin, setting down his mug, "I think you're missing something."
"What?" said Killian.
"Check your brace," said David with a smirk.
"That daughter of yours is really starting to enjoy this," said Killian finally noticing the absence of his hook.
"Well you had better not keep her waiting," said David.
Killian nodded and left the bar.
He found Emma waiting outside for him, waving the hook triumphantly.
"Hello, love," said Killian, running over to meet her. "You interrupted boys' night out, as David was calling it."
"I missed you," said Emma, looking up at him through her lashes.
Killian leaned in and kissed her deeply. "You're forgiven," he said.
-/-
"Kindly give my hook back" said Killian, a bit gruffly, after entering the diner.
Emma was the only patron in the pace, since it was almost closing. Killian figured that granny and Ruby were in the back.
Emma stirred her cocoa with the tip of his hook, and then licked the whipped cream off the tip.
Killian gulped before going over to the table, holding his hand out expectantly.
"Someone's grumpy today," she said.
"What do you expect, Emma? I spent the entire day without you. As much as I love your parents and your new sibling, all the baby talk can get rather tiresome."
"Anything I can do to make it all better?" asked Emma teasingly.
"I can think of a few ideas," said Killian, cupping her cheek and kissing her.
"Why do you do that?" she asked.
"Do what, my love?"
"Kiss me every time I steal your hook?"
"Because the first time you did it, I couldn't kiss you. Your magic is a part of you, Emma. It makes you special, and I think that the fact that you choose to use it on me deserves to be acknowledged. "Every," Kiss. "Single," Kiss. "Time," Kiss.
"I don't ever want to miss an opportunity to kiss you, Emma."
"Well then," said Emma, "Perhaps I should steal your hook more often."
"Perhaps you should."