Hiori took three pairs of clothes, she went to her older sister's room first and put the first pair at the bed, she walked to the door hearing water splashing Hiori coughed then she knocked. "Meimei, I put the clean clothes at the bed. I'll lock the door after I left."
Mumei was standing still inside, not daring to move. When she heard the clicking sound from the outside she then took a deep breath then she quickly washed herself clean.
It's not that she's uncomfortable around Hiori, she was actually thinking of other things... her ears blushed, she took the shower head and placed it on her head, after a few breaths she took a went to the bathtub and stayed their for a while.