Prompt: What if, Rosa runs into you-know-who, and he asks about Kensi and Deeks. Later, Rosa tells them about him, and she finds out who he is.

A/N: I assumed he who shall not be named is referring to Kessler (though personally I don't think he's quite worthy of the title based off canon events).

Rosa leaned forward, examining the small placard attached at the bottom of a case displaying contemporary Native American pottery. Around her, her classmates milled around the Autry Museum, exploring a variety of clothes, artwork, and other objects.

"The detail is amazing, isn't it?" a soft voice murmured, and she jumped, turning to find a man looking over her shoulder. She hadn't even heard him come up behind her. "Sorry to startle you," he added a little sheepishly.

Taking a step to the side to put some distance between them, Rosa offered a hesitant smile. "That's alright."

"Yes, history is an amazing thing, isn't it?" he asked quietly, more to himself than to Rosa. She moved around to the other side, so they were facing each other and examined the next row of pots and vases. "I had a friend who was an artist. Such skill."

"I paint and used to do pottery back in my home country," Rosa offered.

"Really." Rosa glanced up in time to see that he was no longer perusing the display, but rather her. "You know, you seem very familiar to me," he continued, voice dropping slightly. His gaze was intense, and Rosa felt a touch of unease creep up her spine even has his expression remained pleasant. "What's your name?"

"Um, Rosa," she answered again her better judgment.

"Rosa. Pretty name." He tilted his head and then chuckled softly with a look of sudden understanding that didn't seem completely genuine to Rosa. "I think I know your parents, Marty and Kensi."

"Where do you know them from?" She took another step back.

"Oh, Kensi and I are old friends," he explained, lingering on Kensi's name just a little too long. He smiled reminiscently. "Mm, the memories. They told me all about their difficulties with having a child and how blessed they were to adopt you."

"Yes, we've been very happy," Rosa agreed, rubbing her arms as goosebumps trailed along her skin.

"Such a small world," he mused. "Well, I should go. It was nice meeting you, Rosa. Tell your parents Dave says hi."

Rosa watched him go, worrying at her bottom lip. She almost went to find one of the teachers chaperoning the outing but stopped herself. What would she say? That a man who knew Marty and Kensi talked to her?

Rubbing her arms again, she went to join several girls she recognized from her class period.

Hey Rosalie," Deeks called out when Rosa walked into the house around four in the afternoon. She offered a little smile, quietly heading for her room to put away her bags. She was probably exhausted after getting up earlier than usual to prepare for the field trip and longer than usual drives back and forth.

Kensi came home a couple hours later, in time for them to eat dinner as a family. While Kensi talked about her day, Rosa remained unusually quiet, seeming distracted.

"Hey, everything ok?" he asked, gesturing to her mostly uneaten chicken.

"Oh, yes. Something kind of strange happened at the museum today and I can't get it out of my mind," she replied, shrugging it off. Kensi instantly stiffened with concern, her protective instincts kicking in as she carefully asked,

"What kind of strange?"

"This man started talking to me while I was looking at one of the displays."

"A man," Deeks repeated, voice rising. Kensi laid her hand over his, with a soft,

"Babe, let her tell us the whole thing."

Folding her hands together, Rosa leaned forward, looking deeply uncomfortable. "He started talking about the art and then said I looked familiar. When I told him my name, he said he knew both of you. And tell you Dave said 'hi'."

"What did he look like?" Deeks asked, a nasty suspicious filling him.

"Um, he was shorter than you, brown hair, brown eyes too, I think. His jaw was kind of narrow. To be honest, he looked very normal, but when he smiled…" She trailed off, shivering. "It seemed strange. Like he was hiding something."

Beside him, Kensi grabbed her cell and typed something before handing it to Rosa.

"Is this him?"

"Yes," Rosa confirmed softly.

"Oh my god," Kensi whispered. Deeks clenched his fist under the table, furious at the thought of David Kessler being anywhere near Rosa. Let alone dozens of other kids.

"Did he do anything else?" Deeks asked and Rosa shook her head quickly.

"No, nothing. He just made me feel uncomfortable."

Well, at least that was a relief.

Rosa looked between them, eyes wide with confusion and rising fear. "Who is he? Is he a criminal?"

"His name is David Kessler," Kensi answered.

"And yeah, he's a criminal," Deeks added bitterly. "With a vendetta against Kensi."

"Oh," Rosa breathed, face crumpling. Moving around the table, Kensi hurried to wrap her in a hug, whispering soft words of reassurance. Deeks followed more slowly, until Kensi reached for him, and he embraced them both.

"It's going to be ok," he promised. "We're going to make sure he doesn't have a chance to get close to you again."

A/N: I decided that Deeks eventually starts bestowing a variety of nicknames on Rosa too, but explaining it didn't quite fit into the story.