Usagi is a traitorous girlfriend because she giggles a little at Sailor Earth. It also just feels good to laugh? After a flood of such serious and unhappy memories, it's good to remember she can still laugh at her friend's jokes. She's Serenity but she's still Usagi too.

And Sailor Moon.

She's kinda a lot of people now.

"Luna's right," She confirms once she's done giggling. "We have a lot to tell you."