"I didn't. I didn't know. Didn't even meet the kid until my first day here, in the wings."

Buffy knew the real answer but -- having now realized that she'd said too much and was revealing personal facts about Angel that Spike wasn't already privy to -- her tongue stopped wagging so much. Even if it meant letting some of those comments about her relationship with Angel go by without retaliation.

"...Maybe he just didn't want you to go all pouty on him for not being named godfather."

Okay. Maybe a little retaliation.