Megan was still frustrated by the conversation she'd had with Don by the time she made it to CalSci. Upon entering Charlie's office and spotting him at the chalkboard, she couldn't help the words that spilled out of her mouth. "Your brother is an idiot."

"Well. I know for a fact that he had to retake calculus in college," Charlie replied with a grin, turning from the board and grabbing the files she'd brought over. He thumbed through them for a moment in interest before looking up at Megan. Taking in her expression, he dropped the files on his desk and gave her his full attention. "But I have a feeling that you're talking about more than his failure to grasp the fundamentals of derivative equations."

"More like his basic math skills. For a trained investigator, he really doesn't know how to put two and two together when it comes to himself," Megan complained.

"You're talking about his thing for Ian aren't you?" Charlie asked astutely, dropping into his desk chair.

Megan's head shot up. "You know about that?"

Charlie arched an eyebrow. "Don might be an idiot, but I'm not." He then rooted around his desk for a moment before pulling a battered looking blue notebook out of a stack. He flipped towards the back and gestured to an equation. "Plus, I did the math."

"Math?"

"Yeah. Like how, for instance, your team is statistically thirteen times more likely to have a case requiring the assistance of a certain sniper/tracker?" Charlie offered.

Megan squinted at the notebook. "Is that so?"

"It's the only way to really justify why Don brings Ian in on cases as often as he does," Charlie grinned. "Either that, or Don just likes having Ian around."

"Somehow, I think it's that second thing," Megan replied. "So what led you to run the numbers on that?"

Charlie blushed slightly, shutting the blue notebook. "I… uh. Well. Don's Don, you know?"

Megan smiled, reaching for the notebook. She thumbed through the pages, not recognizing much more than the few written notes and the dates on the pages. Charlie had been using the notebook for years. She handed it back. "Is that what this notebook is? Don math?"

"Yeah. Sometimes it's easier to try to figure Don out this way, you know?" Charlie replied; taking the notebook and tossing it back on his desk. "I started this notebook right after he came back to L.A. He was like a stranger then."

"So what has the math shown, other than his thing for Edgerton?" Megan asked, genuinely curious.

Charlie shook his head. "Nothing quite as interesting. Though, I still can't quite figure out how he always seems to know when Dad's making rib eye. It really can't just be luck."

Megan laughed.

A knock on the door drew both their attentions. Amita was standing in the doorway. "Hey Charlie. Megan. Did you get the files for the robbery case?"

"Uh yeah." Charlie replied, shifting papers around on his desk again to unearth the files Megan brought. "Sorry. We got a little distracted."

"Oh?"

"Charlie was showing me his Don math." Megan explained.

Amita glanced towards Charlie's desk, spotting the blue notebook. "Ah. Is this about his crush on Agent Edgerton?"

"You know about that too?" Charlie asked his girlfriend.

Amita walked into the room and perched on the edge of Charlie's desk. "Everyone knows about that."

Megan nodded in agreement. "It's just too bad Don doesn't see it. Colby, David, and I are about ready to give up on getting it through his head."

"David and Colby know?" Charlie questioned

"Charlie. Everyone knows." Megan repeated Amita's earlier words.

Charlie frowned, looking worried. He made to stand. "Even Ian? Oh. This is bad. I've got to tell Don. I—"

"Whoa. Easy Charlie. Ian doesn't know." Megan said, blocking Charlie's exit from the room. "That's what's making this so painful. If the two of them would just stop pretending they weren't head over heels for each other, they'd probably notice that they weren't exactly alone in the way they feel."

"Wait… Ian is interested in Don?" Charlie exclaimed, falling back into his chair.

Megan smiled at Charlie's stunned expression. "Why are you so surprised? I thought you knew…"

"I knew that Don had a thing for Ian, but I guess I never really considered that Ian felt the same. I mean, Ian's…" Charlie trailed, with a wave of his hand. "He's so-"

"Lusting over your brother?" Amita offered.

Charlie eyed her like she was crazy. "What? I was going to say 'straight'."

"Charlie, I thought when you were doing the math on Don that you'd do it on Ian too." Amita said. "He's even more obvious about it than Don is."

"What do you mean?" Charlie asked, still sounding bewildered.

Megan and Amita exchanged glances, neither woman was quite sure how to tell Charlie that Ian spent the bulk of his time around Don eyeing the man like he was an oasis in the middle of the desert. It wasn't exactly the kind of thing you'd want to hear about your own brother. Finally, Amita turned towards Charlie. "Why don't you make your own observations next time you are at the office? Maybe once we have some results from these," she suggested, reaching for the files Megan had dropped off.

Charlie still looked skeptical, but obligingly turned his attention to the case files anyway. "Okay."