Gladly Choosing
Warrick is kissing her, and Sara thinks of the myriad reasons they shouldn't do this.
She's still hung up on Grissom, she's pretty sure that he's in love with Catherine. They work together, so people will talk about them if and when they find out, and if things go bad, work will become a nightmare.
Above all, Warrick is one of her best friends, not that she has many, and that's way too important for her to be screwing around with.
Sara knows all this, but Warrick is kissing her, so she gladly chooses to forget them, and everything else.