Coulda, woulda, shoulda is the motto of Buffy/Riley. Poor kids. Both of them.

And Willow just...Willow. The thing is, she's just so cute about her moral failings right up until she's really, really not that I think no one, not the Scoobies and not us at home watching were willing to take them seriously. And in a way I think that taught Willow that she could get away with it as long as she had her best harmless puppy, 'who me?' face on. And whether intentional or subconcious she most definitely uses it to manipulate the people around her the deeper she gets in. Adorable is the scariest weapon of all, really.