You, Usagi, and Chibiusa were getting ready to go to the fair to meet up with the others, and you and Chibiusa were braiding each other's hair while Usagi puts on her odangos, or what Mamoru likes to call them, "bunheads"

As you guys were getting ready, Mamoru decided to tease Usagi a bit

Mamoru: Nice head, bunhead

He mocks