a) first got together
b) kissed
c) slept together?
Personaly I feel they becaem an offiicial couple around Who Are You? but didn't tell anyone else. The Bronze trip kind of like a first date. From what Willow says to Buffy in NMR I get the impression they are dating. The end of NMR is when I feel they first sleep together but the kiss came sooner; probably around the Flaming o spell.
What do you think?
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"Liberate tutemet ex inferis"
"I am you know... yours"
"I think i'm kinda gay"
"In all my travels throughout the universe I have battled against evil; against power mad conspirators. Ha, I should have stayed here;the oldest civilisation, decadent, degenerate and rotten to the core! Hah! Power mad conspirators, daleks, sontarans, Cybermen... They're still in the nursery compared to us. Ten million years of absolute power; that's what it takes to be really corrupt!"
I