After being taken in and a micro chip being placed in spike's head so he can't harm anything living without intense neurological pain. after he escaped and got out he came to the only place he could think of. Giles's house, and then since the scoobies don't think they can trust him yet they chained him down in giles's bath. And buffy is feeding him blood from one of Giles's mugs. Buffy:"Ahh look at my delicious neck, it is so biteable". Spike:Just stare at buffy's neck wanting the blood