"Imperative"
When Buffy is off searching for a mate, she runs into a seriously bemused Spike.
NC17

"Insatiable"
It's the morning after and the vampire and slayer awaken in the sun-free sewers... still quite horny.
NC17

"Irresistible"
Buffy finally returns to her right mind, however....
NC17

"So Long, And Thanks For All The Sex"
When Buffy wakes up, she finds Spike still in her bed.
NC17

"The Initiative Did One Good Thing"
Thanks to the implant, Buffy and Spike are reunited in the series finale.
NC17