[And when she turns to close the curtain, Natsuru blinks, slightly surprised to see Asuka just walking in. But... it's Asuka, so she doesn't get too worked up or flustered. She just looks a slight bit on the shy, embarrassed side once they're both in and the curtain is drawn.]

Ah... l-let's see... I should try the purple ones on first, I guess...

[She angles herself away from Asuka just out of respect for whatever privacy she might want (as if that's even a factor here), and starts to undress. But it's not long before the advantage of sharing the fitting room comes up.]

Um, could you help with the zipper, Asuka-chan?

[Not that she can't get the zipper in the back of her dress by herself in a pinch, but it's always so much easier with help.]