Zenitzu is Nezuko and Nezuko is Zenitzu

Agatsuma Zenitsu

What?! I'm... I'm Nezuko-chan?!

Agatsuma Zenitsu

This can't be happening! How am I supposed to protect her now?!

Kamado Nezuko

Mmph? Mmph mmph!

Kamado Nezuko

(Why do I look like Zenitsu? And why can't I speak properly?)

Agatsuma Zenitsu

Nezuko-chan! You're me! And I'm you! This is terrible!

Agatsuma Zenitsu

How will I ever confess my love to you now?!

Kamado Nezuko

Mmph mmph mmph.

Kamado Nezuko

(Calm down, Zenitsu. We'll figure this out somehow.)

Kamado Tanjirou

What's going on here? You two smell... different.

Agatsuma Zenitsu

Tanjirou! Help us! We've switched bodies!

Agatsuma Zenitsu

How will I protect Nezuko-chan if I'm Nezuko-chan?!

Kamado Nezuko

Mmph! Mmph mmph mmph!

Kamado Nezuko

(Brother! Help us fix this! And why does Zenitsu keep this thing on?)

Kamado Tanjirou

Oh boy... This is going to be a long day.

Kamado Tanjirou

Don't worry, we'll figure this out together!