Finds Lucy in Erza's body.

Erza wakes up when she hears knocking.

Erza: give me a second.

She answers the door and sees someone who looks like herself struggling to wear her armor and immediately realizes that it's Lucy.

Lucy (Erza's body): Erza help! I can't use your re-quip magic to change to regular clothes!

Erza then teaches Lucy a little bit of re-quip magic to change into one of her casual outfits after a few minutes of trial and error.

Lucy: Thanks Erza. I thought that armor was going to kill me.

Erza: Looks like we'll have to learn how to be each other for a while.

Erza and Lucy look at their own bodies and each others.

Lucy: It feels nice to be taller for once but why are your body's breasts even bigger than mine or Mirajane's. With your armor, your back pains must get crazy.

Erza: You get used to it after training in heavy armor for a bit. If you want I can give you a massage to help relieve it. That or I can try summoning one of your spirits to help.