Buffy's relationship with Spike in the comics varies. Sometimes they have significant interactions and may even be romantically involved, but it's not a constant throughout all the comic series.
Spike MLP Fanfic is a type of fan - made literature that focuses on Spike in the context of My Little Pony. Fans write these stories for a variety of reasons. Some might be huge Spike fans and want to give him more spotlight. Others might want to explore different storylines that could have happened in the MLP world involving Spike. It can range from humorous tales where Spike gets into comical situations to more serious and emotional stories about his place in Equestria and his relationships with those around him.
I'm not sure specifically what the'spike story' is as the term is rather general. It could be about a character named Spike in a particular movie, book or TV show. Maybe it's about a sudden increase (a spike) in an event or situation and the story around that.
It varies from comic to comic. Sometimes they have a romantic connection, while in others, their relationship is more complicated or not existent at all.
The status of Spike and Buffy's relationship in the comics varies. Sometimes they are shown as a couple, while in other instances, their relationship is more complicated or undefined. It all comes down to the particular comic series and its plot.
Their relationship could develop through shared experiences. For example, if they volunteer together for a community project in Ponyville. They'll get to know each other better and start to respect each other's abilities. It could also develop if Spike helps Cheerilee with a problem in her classroom, like dealing with a difficult student. This would make Cheerilee see Spike in a new light.