I remember that story very vaguely. Its sure post series. Angel shanshued he is not very talkative and drawing pictures all the time. Spike have shaved head and Angel draw him picture of new him as goodbye. Portret made Spike say something like: Wow now I get why every one try to jump my bones! Angel also gives Spike his portret from long ago (might be Spike was just turned). I remeber Spike leaving for slaying duties far away (Alaska?!) and don't want to take Buffy with him but she tugs along anyway. I believe Spike dont trust Buffy in a way. There are more then one sex scene but Buffy showing her feeling more than Spike.