"Where to next, princess?" Usopp asked, holding your hand to his lips to kiss it. He had been treating you like this all day..

He had lost a bet to Nami, in where she bet that Usopp wouldn't confess to you in two days. He failed, and you didn't know of his crush, but he started treating you like a princess for reasons you didn't know.

You went along with it, him giving you the princess treatment all day. It was so cute!