This takes place after the recent C.S.I. season finale. After leaving the hospital Warrick takes Catherine home.

"Do you want to come in?"

"I don't want to wake Lindsey."

"She's at a friends, come on at least have a drink."

"Alright."

The two drink for a while and talk before Warrick decides to go home.

"Well I better get headed home."

"Are you sure you can stay you can crash in Lindsey's room."

"Yeah." Suddenly Warrick and Catherine's eyes meet and in their drunken state they see something different in each other. They lean in and passionately kiss.

"Catherine what if Lindsey comes home?"

"I'm going to pick her up later."

"Oh."

"Come on." That was where the mistake was made they allowed their drunken thoughts take them over. It would have saved Catherine a lot of pain if she had just left it at friends, without the benefits.

Several weeks later: Sara goes into the locker room to put on a new shirt because she spilled coffee on the one she had on. Half way through buttoning her shirt she hears the faucet turn on.

"Hello?"

"It's just me."

"Oh, I'm glad I caught you Grissom wants us to get out to Henderson."

"Ok, give me a minute."

"Ok."

Sara walks over to where she can see Catherine and finds her brushing her teeth.

"What are you doing?"

"Vrushingvyfeefh."

"Was that English?"

Catherine spits rinses and then replies.

"Yes it was."

"Why are you brushing your teeth?"

"I had to run out the door without brushing my teeth because I was running late."

"Good enough for me are you ready to go?"

"Yep."

The crime scene: Catherine takes one look at the body. She sees blood and runs across the road.

"Catherine where are you going?"

"I'll…" Sara follows her, as soon as she realizes what's going on she grabs Catherine's hair just in time to get it out of the way.

"Are you ok?"

"I'm fine."

"Since when has blood ever bothered you?"

"I don't know, I just am not feeling to great today."

"Oh, you don't look that great, you look tired, and pale."

"I know we should get back inside."

"You aren't going to puke again are you?"

"No, I'm fine."

"Are you sure because you don't look fine."

"I'm fine Sara drop it."

The end of the day:

Sara finds Catherine sitting on the bench in the locker room.

"Are you ok?"

"Yeah I'm fine."

"Are you 100 sure nothing is bothering?"

"Yeah." Catherine says as her eyes start to fill with tears.

"Then why are you crying?"

"I'm not. Look Sara please just stay out of it."

"Ok, but if you want to talk…"

"I don't ok?"

"Ok."

Warrick walks in and Sara leaves he starts to talk to Catherine it had been his first real chance to.

"Hey Cat about the other night."

"It shouldn't have happened it was a mistake. It was a bad decision on both our parts."

"This isn't going to change the fact that we're friends is it?"

"No, Warrick we we're drunk and it wouldn't have happened otherwise."

"Right, I just don't want this to be a thing between us."

"Warrick just forget about it, it wasn't a big deal."

After Warrick leaves Catherine continues sitting there for a few minutes.

"What is wrong with me?" Catherine thought for along time and then had a horrible feeling. Instead of going home she stops by the doctor's office.

A/N: Sorry it's there are gaps in time, but I can't write a whole story about something that takes place during only one day. P.S. first C.S.I fic so please be kind.