Okay so Spike had this crush on Buffy but Buffy kind of thought he was gross. So he had this crazy engineer build a life-sized replica of Buffy so he could use her as a sex doll. It worked for awhile until Xander and Anya ran into Buffy Bot who talked about Spike sex and his abs. So they staged an intervention with actual Buffy and then the cat was out of the bag in an ew kind of way. But then eventually, hilarious.