Based on the second prompt from seastarved. You can find it on her tumblr under the #CHPC prompt tag. Shout out to gillie, who will definitely get the U2 reference in my title.

"ul-tra-vi-o-let [adj.] - Used to describe rays of light past violet. Under ultraviolet light, things that are invisible to the naked eye become visible."

She had to congratulate herself. It's not easy to have a Halloween party in a studio apartment with only two chairs from a dumpster dive and a bed, but everyone seemed to be having fun in Emma's place. She was having fun too, especially considering she had a gorgeous man lounging on her bed.

"So you're a modern pirate?" she asked.

"Captain Hook, love," Killian replied. "Hence the hook."

"First, that's a piece of plastic from a discount store. Second, Captain Hook wears a red coat. And third, none of that explains how you had so much leather in your closet."

"I need to leave some things to the imagination, lass," he said.

She smiled and took the last sip of her beer. "Am I going to have to bribe Liam for the answer?" she asked.

The two of them turned towards the older Jones brother standing in front of them, holding his beer with werewolf hands. Liam drained the last of his bottle and smirked.

"Some secrets should stay between brothers," he said. "Also, I need another drink."

Emma pushed herself off the bed, holding her hand out to take Liam's empty bottle. "I was on my way anyway."

She left the Jones boys behind to weave her way through her guests towards the corner nook that doubled as her kitchen. With a place that small, her kitchen consisted of a hot plate to warm pots and a bar fridge that was living up to its moniker tonight considering the only thing in it was beer.

Emma tossed the bottles into a small trash can she labeled for recycling and picked out three more beers from the fridge. Turning back, she caught sight of the Joneses charming her friend, Ruby, who was wearing a red flapper dress. Liam was being his smooth self as usual, Killian less so, but then that was exactly what they were like when Emma first met them a year ago.

A year? It didn't seem like it had been that long ago when she met the two of them while trying to take down a bail jumper down by the docks. It was Captain Liam who had tackled her bad guy and then tried to turn on the charm while his respectful lieutenant stood by, his strong arms keeping her perp in his place. In the months since, they had become fast friends. Like Emma, the boys' parents had left them to fend for themselves - something that became an instant connecting thread among them. Liam once admitted he was trying to develop more than a friendship with Emma on the docks that day but soon realized he would rather her be the sister he never had.

Killian had once said the same thing to her, and she loved having that role in his life, but tonight was just reinforcing her belief that maybe that's not what she really wanted. As she stood there looking across her small apartment to the boys sitting on her bed, a dreadful thought began to creep its way into her head again: Emma wanted something more with Killian. She didn't know when it started to happen or why. She just began to realize that there was something more there - at least from her side. And what was worse is that she never really had any indication from Killian that he felt the same way.

Taking a deep breath and pushing her emotions into a dark corner in her mind, she slowly worked her way through the crowd back to her bed. By now, Ruby had taken a seat next to Liam, causing Emma to squeeze herself between the Jones boys. She handed Liam his beer, then turned towards Killian, her fingers brushing against his, causing her to almost drop the beer in shock. Killian just smiled and took a sip from the bottle.

"This does not taste like rum, Swan," he said.

"It's called cheap beer, you scurvy pirate," she replied.

He put the bottle close to his lips and smirked. "I prefer dashing rapscallion," he said, taking another drink.

Emma smiled and quickly turned back to her other guests, trying to distract herself with the noise and conversation. It helped that Ruby was giving her crap for ditching her cat ears.

"Now you're just a woman in black leggings and a tank top."

"Ah, but even without the ears, she's still a minx," Killian said, giving her a wink that made her breath hitch even though she knew he was just joking.

Emma steered the conversation into more innocent territory, asking Ruby to entertain them with stories of her worst customers at the diner, and Liam soon jumped in to discuss the badly behaved bank execs on their booze cruise last week.

Emma finally got up and said goodbye to guests or chatted with some of her other friends. But as the night came to a close, she realized that there were only four of them left in her little space. As soon as Ruby excused herself to go freshen up, Liam was all over her with questions.

"So what's Ruby's story? Does she have a boyfriend? Is she crazy? How good of a friend is she really?"

"Whoa there, tiger," Emma replied.

"I'm a werewolf," Liam said. "Now talk quickly."

Emma put her arm around Liam. "She's awesome, but try not to bite, OK?" she said teasingly. "I can't remember if there's a full moon out tonight or not."

Liam gave her a lopsided smile and a peck on the cheek before turning to his brother. "Don't wait up."

Killian smiled in reply. "Wasn't planning on it."

Ruby came out to say goodbye and Liam suavely said he could walk her home. Emma totally noticed the smile on Ruby's face as she walked out the door, leaving only Killian in Emma's apartment. With her. Alone.

"So do I really have to worry about Liam not coming home tonight?" he asked sarcastically.

"Well, Ruby can be a wolf in sheep's clothing sometimes, but I doubt he's going to get lucky," she replied.

Emma dumped the last of the trash in the garbage as Killian walked over to retrieve his hook from her bed. It was hard not to notice his devilish grin as he slid it back on.

"Alright, Swan. I better be off too. I want to see how long it will take me to hail a cab with this thing," he said enthusiastically before coming over to give her a hug. "It was a lovely evening with you as always."

"Yea, I'm glad you guys were able to make it," she replied.

Her hand casually slipped from her shoulder as he turned to walk out the door, and Emma was trying everything in her power to stop herself from making him stay. It wasn't working.

"Um, Killian?"

His hand paused on the doorknob and he turned , his piercing blue eyes looking right at her.

"Listen, I was thinking about something, and it's really no big deal or anything. It's just ..." She looked up to see him staring at her, trying to anticipate the next words out of her mouth. "Would you like to go out to dinner with me sometime? Like on a date?"

"What?" he asked her, a shocked look on his face as his hand slid from the doorknob.

She should have listened to the voice telling her this was a bad idea. "You know what?" she said, casually waving her hand in the air. "That sounded weird so just, um, just forg-"

She couldn't finish her sentence before Killian's lips slammed against hers, his arm finding the perfect spot in the small of her back to forcefully pull her closer to him. At first, she was too in shock to respond before she finally leaned in, reciprocating the hot passion on his lips. Her arms snaked around his waist under his heavy leather coat and she could feel the scratchiness of his chest on the skin above her low-cut tank top. There was a small "thud" as he dropped his stupid plastic hook to the ground, freeing his left hand to reach up and caress her cheek, directing the angle of her lips as he kissed her deeper.

Emma was getting light headed and she finally had to pull away slightly to catch her breath. She could feel Killian's scruff on her cheek, causing her to nervously laugh before he pulled back further to look at her.

"Bloody hell, Swan," he murmured. "It took you long enough, didn't it?"

She gave him a perplexed look. "What does that mean?"

Killian's hand came up and tucked a stray curl behind her ear before trying to smooth down her tousled hair. "I've been waiting months for you to give me a sign that you wanted something more."

Emma pulled back more, trying to calm the craziness in her head. "Months?"

A look of panic washed over Killian's face and Emma was worried that wasn't the right reaction. "That's sounds creepy, doesn't it?"

"No," she said, shaking her head. "It was just time wasted because we wouldn't say anything to one another."

Killian smiled, his happiness reaching well beyond his eyes. "Well, I'm just glad you did."

"You know, we'll have to tell Liam about this."

Killian hesitated. "I'd rather wait a little."

Emma realized she hadn't really thought about how Liam would react, and she started to get worried. "What do you think he's going to say?"

Killian smiled. "Probably 'I told you so.'"

"He knew I felt this way?"

"He suspected," Killian said quietly before ducking his head so he could look into Emma's eyes as he stepped closer to her. "Now, can we please stop talking about my brother? I want to kiss you some more."

Emma smiled. "As you wish, captain."