Like writing individual characters, writing scenes with Buffy AND Spike will sound different depending on which season you are writing in. However, usually no matter what season you are writing in, they will always be bickering some. Dialogue is an important aspect to their relationship, especially through their arguments and verbal spats.

    I suggest reading over Writing the Vampire and Writing the Slayer in order to understand them separately and then glance over this to see if there's anything else you need to know before sitting down and writing up your story.

    1. Season 2, 3, and 4:

        At the start of season 2, Buffy and Spike's only interaction was because Spike wanted to kill his third Slayer. However, neither of the two was able to kill the other and they wound up forming an alliance to stop Angelus from destroying the world (Becoming ll).

        Their relationship continues along like that for the next two years. When Spike returns in "Lover's Walk," Buffy puts up with him solely to get Willow and Xander back while Spike uses Buffy's help to gather supplies needed for the spell. Then, after Spike is chipped, Buffy and Spike form another loose alliance to help each other out. Spike is usually helping so HE can benefit somehow -- cash, beer, blood, etc., but winds up helping Buffy and her friends several more times.

        Up through season 4, most of their conversations are spent on bickering, arguing, threatening to kill each other, etc. Both are sarcastic and uncaring towards the other person. However, their arguing does bring them closer together and soon, Spike is around everywhere she is. What's most important is that both fought each other many times, but are always unable to kill each other...as if they enjoy "dancing" (as Spike calls it) too much.

    2. Season 5:

        The beginning of 5th season starts off much like every other for Buffy and Spike. However, in a pivotal dream, everything will change for Spike. "Out of my Mind" introduces to notion that Spike is in love with Buffy. Not just lust...not just desire, but love. He's horrified with this epiphany at first, but faces the facts. Now he is trying to act good in front of her (Triangle) and get her attention, but nothing is working.

        Following in the same path as William's love for Cecily, Spike has chosen to fall in love with a woman who is above him and who stands for the complete opposite thing he does. At first, Spike's love for Buffy is just an obsession. He dreams about her, almost stalks her, has a mannequin, and has a shrine to her in his crypt. Of course, when Buffy finds out, she is disgusted (Crush). She turns all her friends completely against him, including Dawn, in hopes to make him fall OUT of love with her.

        Spike's love for Buffy comes to an all high obsession in "Intervention" when he has a robot created that looks just like Buffy that will do anything he requests -- and I mean anything. It's basically a sex-bot, and the gang realizes that. However, when Spike is captured by Glory and tortured for knowledge of where the Key is, and Spike refuses to tell, Buffy realizes that Spike's love is true.

        When writing at this time, Buffy is aware that Spike really does love her, Spike knows that Buffy will never love him back as the two work together one last time against Glory. Also, when writing in season 5, depending on if its closer to the series premiere or finale, sometimes writing Buffy and Spike as if there many vibes of UST -- unresolved sexual tension, between the two will help. 

    3. Season 6:

        At the opening to season 6, Spike has kept his promise to Buffy and protected Dawn. He's taught her card games, now is the babysitter, and helps the gang keep Sunnydale under control. It is clear that Buffy's death rests heavily on his shoulders since he had the opportunity to stop Doc from cutting Dawn. The guilt is very clear.

        When Buffy comes back, at first he is amazed, then he is helpful, then concerned for her, but then Spike's attitude takes a sudden turn. Spike realizes that the only reason Buffy spends time with him is to get away from her friends, the people who don't know where she really was while she was dead. Spike realizes that Buffy is using him -- the first time of many, and tries to push her away. They kiss first in "Once More With Feeling," and then again at the end of "Tabula Rasa." Then, in "Smashed," Spike realizes that he can hit Buffy now and the chip doesn't go off. It is also the moment where Buffy and Spike consummate their dark relationship.

        Now, their relationship is very dark. Spike's "love" for Buffy has changed into a dark tone, where he insists that he "be in the dark with him," and so on. Buffy doesn't know how to deal. She knows that she shouldn't be attracted to Spike, but the only time she can actually feel alive, or anything, is with him. There is a lot of using and abusing during this time of their relationship. If you're writing in 6th season, the only advice I know how to give you is to keep things dark and angsty. There probably won't be too many opportunities for fluff in season 6 as there aren't many happy times between Buffy and Spike if you stick with the cannon universe.

    4. Season 7:

        Spike returns from Africa with his new soul and is insane at first. Buffy has gotten accustomed to living once again and his helping Dawn patrol now. This is how we open up to season 7.

        As Buffy and Spike work once again to stop The First, Buffy begins to place more faith in Spike. It's almost as if they are starting over again now that he has a soul and she is no longer living as she was a year ago. Buffy trusts him even when his chip might be triggered to go off, and then she trusts him enough to get the chip removed entirely. Buffy feels that with Spike now having a soul, she might be able to love him. She trusts him and believes in him, which gives Spike the energy to try and stay alive when the First takes him. However, she keeps any notion of her feelings for Spike a secret from everyone else.

        Nevertheless, Giles and Robin both notice it. When they team up to try and kill Spike and Buffy places her concern for Spike over everyone else's, it is clear that Buffy has feelings for him. She says that she needs him because he is the only other good fighter they have, but is it really JUST that?

    One thing I'd keep in mind is that Spike has always accepted every part of her. When Angel wanted her to be like a normal girl, when Riley wanted her to be less like the slayer, Spike never minded; in fact, he didn't care at all that she was the slayer, he loved the whole package. ("When I say I love you, it's not because I want you, or because I can't have you, and it has nothing to do with me. I love what you are. What you do. How you try. I've seen your kindness and your strength. I've seen the best and the worst of you, and I understand with perfect clarity exactly what you are. You are a hell of a woman. You're the one, Buffy." Touched)

        When writing in season 7, I'd try to make it so the reader knows that Spike is working with his soul to prove to Buffy that he is a good man and earn redemption in her eyes, something that Buffy can clearly see by the later half of the season. Show Buffy slowly opening up. Like I said, she is afraid of being hurt again and wants to make sure that she won't be before giving her heart away again, but by the end of season 7, they have surpassed their harmful relationship they had in 6th season and found real, true love.

        At least, that's what this hopeless romantic thinks.

Did I miss anything? Want me to add something? Let me know!

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