(MC POV)
I tried asking Iris what happened that made her transform into her younger form but she had no answer for that as well. Or rather, her only response to any of my questions has just been "Auuuuuu…" so far.
When I patted her head again, she did not change to her younger form so it really was a mystery why such a thing even happened to her.
Oh well, not that it really matters anyway.
One thing's for sure though, Iris became really shy after she changed back since she remembered everything that happened in her other form.
She spent the entire night huddled in the corner of the tent while using my robe to cover herself.
Even when she reappeared the next morning, my robe still hung over her head, hiding her face from view.
Even despite my multiple assurances that it was alright, the only response she gave me was "Auuuuu…"
Thus, I left her in my disciples' capable hands to help her out of her embarrassment.