I'm interested in fics similar to Ameeya's "Beloved in Blood". I'm not talking about claim fics in general (although I'm not excluding the possibility) but, more specifically, stories where Spike and Buffy are initially forced to be together because of magic or whatever other supernatural reason and in the process they fall in love.

What I like in this particular story is that the protagonists are very true to character and it's because of this that they have to be somehow coerced to be together, at least at the beginning.

Ameeya and Holly are actually the same author, so you might be interested in a few of HollyDB's fics.

Dreamscape by Holly

While her nights are occupied fighting evil, her dreams are haunted by a devastatingly sexy, not to mention thoroughly evil vampire. The sort of vampire that embodies the definition of forbidden fruit; the sort of vampire Buffy can only have in fantasy. But how thin is the line between dreams and reality? More importantly: how thin does she want it to be?

Fixing the Factors is a good one, I'm blanking on the author right now. But basically Drusilla casts a spell that makes everyone repeat a day in Season 4, and only Buffy and Spike are aware of it. Another one might be Dust by KnifeEdge, where all of Sunnydale is asleep except for Buffy and Spike.

And of course, West of the Moon, East of the Sun by KnifeEdge is excellent, and mythical, too.

Blood Bound by DreamsofSpike

Fixing the factors is by maryperk

The chains series by Lynx unfinished but very good. It's an old story but I think it can be found by using google.