Relationships do form.

Warrick and Sara work together, nearly sharing a brain. They work the same with Grissom, but for different reasons.

No one says anything when Nick and Warrick arrive together, even though Warrick's shirts don't fit Nick well.

When Sara is in a case and forgets the people she's working with have feelings, Nick rolls over for her. Warrick won't do that.

Grissom doesn't know how to classify Catherine. He refuses to classify Sara.

Grissom amuses and frustrates Catherine. She's considered just giving Sara her key to Grissom's townhouse.

Relationships form, whether you want them to or not.