I will keep my eye out for good introductory fic, but I found a site with quotes that should give you the idea:

Lynda: "I'm thinking of habits I'm wanting to kick."
Spike: "So I'm a habit already?"
Lynda: You're something I'm wanting to kick.

*

Spike: "So why talk to me?"
Lynda: "I like to know I'm the smartest one in the conversation."

*

Spike: "You don't happen to be jealous of a girl I've never even met, do you?"
Lynda: "Of course I'm jealous, Spike. I wish I was the girl you've never even met."

*

Kenny: "Lynda, do you remember asking me to tell you if you were ever being insensitive or too demanding?"
Lynda: "No."
Kenny: "Well that's because you haven't, but you would have if you were less insensitive and demanding."

*

Kenny: "Graphic Department spending proposals. An HB pencil and a sunbed?"
Sam: "Well, I can explain the pencil."

*

Sarah: "Can you explain to me how I have just argued myself into doing exactly what you wanted me to do in the first place? You are a devious, unfeeling, calculating, manipulative bitch."
Lynda: "Well you were asking what made me a better choice for editor."

*

Kenny: "What are you doing in my wardrobe?"
Colin: "Well your mum said I could wait in your room."
Kenny: "I don't think she meant in my wardrobe."
Colin: "Would it have killed her to be a little more specific?"

*

Colin: "Spike, baby. I didn't know you were back from Birmingham."
Spike: "America, Colin. I went home to America."
Colin: "No kidding - I thought you were from Birmingham."

*

Lynda: "You and me Spike, we're held together by a force even stronger than true love."
Spike: "Which is?"
Lynda: "We both want the last word."

*

That's the basic idea. Sort of. It doesn't explain Colin... ;-D