Spuffy related or think they are related

Looking for fics where Buffy and Spike are related, think their related or grew up together and are fighting feelings for each other. Completed prefered or regularly updated WIP.

Thanks : )

The Bond by dampersandspoons (Love this one!)
Do You Want To Die and its sequel Never Say Never by vamptastica (at Just Rewards).

Wow thanks guys

The Attic by jennybean

Summary: After the death of her husband, Joyce is forced to move with her four children back to Sunnydale to live with the parents that disowned her years ago. At Rayne Manor, siblings William and Elizabeth try to protect their family from their evil grandmother Drusilla, while uncovering secrets of the past and creating a few of their own. Loosely based on the book 'Flowers in the Attic.' WARNING: Will eventually deal with incest.