Spike and Angel have a conversation in a bar, post-Illyria, heavy on the snark. One-shot.
Post-NFA, Illyria awakens from a nightmare and broods, while Spike attempts to comfort her. One-shot, part of the "Cold Comfort" collection.
Post-NFA, Spike and Illyria the only survivors. He's ambushed and badly injured, she helps him the only way she knows how. One-shot, part of the ColdComfortVerse.
Directly following Not Fade Away, Spike and Illyria offer each other what comfort they can. Illyria's POV. Offscreen character deaths. One-shot, but Part One of a series.