I'll help and then come for you.

Then I'll go join up with the girls.

Well then, we'll have some tea in my room so they don't spot you, Nagato.

As for what they're doing, recall what happened when it was Haruna's turn. Remember?

Hey! Why so disappointed, Nagato?

Her remodeling just finished up a little while ago. She'll be coming here any minute.

Everyone went off to prepare something so you wouldn't find out. In secret.