Buffy is a slayer/vampire hybrid (like the Marvel character 'Blade'); she feeds on Spike to survive.

Hi,

I tried searching for this but could not find it. Buffy is partially turned, she can still go out in the sun but needs blood to survive. She ends up feeding from Spike to survive. Thanks in advance for your help!

That story may be Blood that Binds by Behind Blue Eyes. It's here on spuffy realm.

Or it could be "The Demon in Me" by Spikeschilde

Thanks! Both of these stories fit!

But...which story was the one you were actually looking for. You're in the hefind-a-fic thread so that means this is a specific fic you're looking for.

Blood That Binds is what I was looking for. Thanks!