Source: Hulu (and the official BtVS Instagram account)

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Source: Hulu (and the official BtVS Instagram account)
Rainbow Rowell about Buffy/Spike.
“What’s brilliant about Spike—and later Spike and Buffy together—is how deeply we get to know them. Not just at a skin level; at a soul level. Spike and Buffy talk about everything.”
“That’s the voyeuristic thrill of loving love stories. Seeing them find each other, learn each other, sleep together, wake up together, patrol the cemetery at night, side by side.”
http://lithub.com/10-famous-writers-on-loving-buffy-the-vampire-slayer/
Who’s Buffy’s greatest love ? (Paris Manga)
“I think the relationship with Spike was more what we deal with in a long term relationship.” - Kristine Sutherland
“Spike and Buffy, Cordelia and Angel” - Charisma Carpenter
Hunting for shoes aside, what do you think Spike would be doing in 2017? "In 2017, Spike would be making sweet love to Buffy Summers! I think eventually, with enough time, Spike – since he has a soul – would mature into a vampire who would be right for her. I don't think that he was the right pick for her while we were doing the series. But I think give it enough time to grow up and he would make a very good partner for her.
James Marsters, Digital Spy Interview
Who’s Buffy’s greatest love? (Paris Manga)
“I think Joss actually said the same thing. That ultimately, the best one for Buffy is Spike. But not from the show.” - James Marsters
Kristine Sutherland and Charisma Carpenter’s answers