-I don't own anything!
-This probably sucks, it just came to me in a dream = P.
In their bathtub, Xander was grateful that Vampires didn't need to breathe, meaning Spike never had to stop; and as Xander was thinking of this, Spike was thinking how grateful he was that Vampires had amazing hearing.. that way as he bobbed up and down under the water, he could still hear the sounds that Xander was making.
"Spi-i-ke.. st-op. Tonight was supposed to b-be about you, not me.. so.. god.. sto-
"Mm, luv.. anything to do with me, has everything to do with you."
.. and with a wink, back down he went;).
Xander was grateful that Vampires, gave him Spike.