Buffy is the slayer, her and spike are lovers, but she chases him out of town. They have a son. Riley is a vamp chasing after Buffy. Spikes clans return to Sunnydale, spike reclaims his slayer. Can't remember much else...i read it on here but forgot to save it as favourite and want to read it again. Please help!

Could it be "La Cosa Nostra: La Famille Vampire" by spufette?