Chapter Four- Whatever It Is That Girls Do
Then Sabrina picked at his shirt, "You have some red stuff on your shirt."

Derek looked down to see a few spots of ketchup on his jersey, probably while they were cleaning.

"It's just ketchup," Derek mumbled, pushing her hands off him.

Sabrina looked at him quizzingly, but the elevator dinged that they were on the right floor.

They reached the lab to see Dr. Donn there, waiting for them.

"Hello, guys."

"Hey."

"What's up?"

"Okay, so the mother's fingerprints were in the victim's room, and outside. As for the blood. Two people. But the blood by the window, it wasn't either of them. It'll take us a little longer to see who's it is, but we believe that it's both of there's, clashed into one spot. But that might take a while. By the way, the design of her house is done," Dr. Donn said, handing Derek the model of Casey's house.

The two went back up to their office, and placed the model on an empty table.

"Emma was here," Sabrina said, placing the toy version of Emma in her bedroom.

"Casey was here," Derek said placing another toy in the room next to Emma's.

"There was no holes in the fence, so the person had to use the gate. Prints were found all around here," Sabrina said, tracing her finger along the board, "And the print that had only showed up twice outside, was right by the gate."

"The glove that I had found was about half a meter from it."

"You found a glove?" Sabrina asked.

"Yeah. I told you on the phone didn't I?"

"Not that I remember."

"Oh well. I found a glove in her yard. Did you guys find the other one?" Derek asked.

"No, didn't you look for the other one?"

"No, I assumed that you guys had already found it," Derek shot back.

"Another trip back to the house," Sabrina grumbled.

Derek knocked on Casey's front door with gloved hands, while Sabrina pulled on her gloves, and holding a silver suitcase, identical to Derek's.

"Lizzie, why am I on speakerphone? Lizzie? Liz!" they heard Casey say loudly, as she came to open the door.

"Yes, mom; I'm sure your step-son is doing his job. What else would he do? Go to a strippers club?" Casey said, as she pulled open the door.

"Hold on," she said into the phone, before focusing her attention to the people on her doorstep.

Sabrina glared at her with hateful eyes that read, "Keep your hands off my man."

Derek with standing there with a smirk, obviously hearing Casey's conversation with the family.

"Hi guys," Casey greeted.

Derek said, "Hey Case, we're gonna check out your yard again, kay?"

"Yeah, go ahead," Casey said, quite fully knowing that Sabrina was glaring at her.

Casey shut the door, while talking on the phone.

"Stop jinxing me, Edwin!" Casey shouted, locking the door.

Derek couldn't help but laugh out loud.

Sabrina stared at him.

"Sorry, anyways," Derek said, stopping his laughter, "I found the glove right here. Under a pile of wood."

They spent another hour, before putting everything, then leaving Casey's property.

The next day, Derek spent the whole day trying to figure out who the kidnapper was.

Casey sat back in the seat that she had sat in the day before, in the same cell; with Derek sitting across from her, and Sabrina standing behind him, eyes glaring at Casey.

"Anyone out to kill you?" Derek asked, notepad in front of him with a pen.

Casey thought about it for a moment, "To kill me...no."

"To kill Emma?"

"No one that I could think of."

"Any friends?" Derek asked.

"Emily? But I don't think she'd wanna kidnap Emma though..." Casey said.

"But you know though...You should drop by her place and give her a visit..." Casey thought out loud.

"Is she still obsessed with me?"

Casey didn't say anything for a few seconds, thinking about it, "...Yeah. Her pillow cover is a picture of you."

Derek stared at Casey in horror; Sabrina nodded thoughtfully, thinking that that would be a great idea.

"Anyways...next question," Derek said abruptly.

"Who's the father of Emma?" Derek said.

Casey looked away.

"Casey. Listen to me. He may be the key to this whole puzzle."

"He's not."

"How can you be so sure?"

"Because."

Derek rolled his eyes, "You need a better answer than 'because', Case."

"Because I know that he's not a bad guy."

"How can you be so sure?"

'Because he's sitting in front of me,' Casey thought.

"Casey, if you don't tell me, I'll do something drastic to get the answer out of you," Derek said frustrated.

Casey looked at him with a raised eyebrow, "Go ahead, Der-ey."

"Stop quoting Kendra."

"Who's Kendra?" Sabrina asked curiously.

"Ex-girlfriend."

Casey smirked, "Who he changed to look like a---"

Derek threw himself over the desk and on to her.

Then he picked the two of them up, and pinned Casey against the wall.

"Stop it," he hissed a centimetre beside her right ear, sending shivers down her spine, and having her knees buckle.

'Thank God he's holding me up,' she thanked in her head.

Casey turned to him, and said quietly, that Derek was barely able to hear her, "But she has a crush on you. She deserves to know."

"You're over-estimating my self-control, Princess."

"Fine."

Derek let go of her, and she went back to her chair.

While Derek stood there, his head against the wall, and hands flat on the wall, trying to re-gain his self-control.

Derek sat down, reached into his wallet, and threw several fifty-dollar bills at the table in Casey's direction, "Go. Shopping or whatever girls do. Now."

"Aw, now you're being such a nice brother," Casey cooed, picking up the bills.

"Casey, go. Now. You're driving me insane, and giving me a headache," Derek growled, pointing at the door.

"Fine," Casey said, getting up and leaving.

Derek banged his head against the table.

"You guys are silblings?" Sabrina asked curiously.

"No, are you insane?" Derek said, "I'm a Venturi, and she's a fast-food restaurant. Not related."

a/n: fast food restaurant equals McDonald equals Casey's last name.

'Not by blood, anyway,' Derek thought.

"Then why'd she call you 'brother'?" Sabrina asked.

"Because she knows that pisses me off."

Derek stood up and left the room before Sabrina could ask anymore questions.

Derek sat at his desk, and picked up the picture that was hid in the shadow, and stared at it.

It would have been so much easier if they hadn't been siblings. Sure, they weren't blood related, but living under the same roof was bad enough. They didn't go public, incase people thought they were gross, since he was her brother, and she was his sister. Sure, they were step-siblings, but siblings was in the word, and that was bad enough. So Derek hated being considered as her brother, because he didn't want to be her brother. Being brother and sister had stopped them from going public.

Derek put the photo back in the shadow, and switched on his computer.

He searched Emily Davis, and found the address to her apartment.

He grabbed his keys and headed to the elevator.

He saw Sabrina pass him, "I'm going to find out who the father is."

Sabrina nodded, and Derek stepped into the elevator.

Hm... Will he finally know who the father is? I wonder.