Season 4
4.01 The Freshman4.04 Fear, Itself
4.05 Beer Bad
4.07 The Initiative
4.08 Pangs
4.09 Something Blue
4.10 Hush
4.11 Doomed
4.12 A New Man
4.13 The I in Team
4.14 Goodbye Iowa
4.15 This Year's Girl
4.16 Who Are You?
4.17 Superstar
4.18 Where the Wild Things Are
4.19 New Moon Rising
4.20 The Yoko Factor
4.21 Primeval
Season 5
5.01 Buffy Vs. Dracula5.02 Real Me
5.03 The Replacement
5.04 Out of My Mind
5.05 No Place Like Home
5.06 Family
5.07 Fool For Love
5.08 Shadow
5.10 Into the Woods
This season only contains up to where Riley leaves, I am considering putting Buff/yRiley related quotes from later episodes but at the moment this is all there is.