Favourite fics episode specific: Butterflied
in random order

Kiss of the Butterfly by Amanda Hawtorn
The Room by Spike Speigel1
The Holly and the Ivy by VR Trakowski
Beyond Butterflied by Laura Katharine
Billy Joel Trilogy by Tripplepirouette
Resignation by ShannonSto
Butterflying Sara by ShannonSto
Second Sight by Anansay
Provoked by Battus Philenor
Secret of Faith by Binx-349
Butterflied Redux by Jonathan-CSI
Turnabout is fair play by kjt1
Even geniuses are idiots sometimes by Forensicsgirl