Because Koushi has learned the secret of your power that can go back to the past to fix things by taking off your underwear. Now he becomes your personal shelf that will always put on you new underwear after you finish using your power. Even now is Koushi's first attempt to put on your underwear after you finish using your power. His face is full of nervousness and awkwardness but finally he managed to put on your underwear and finally he sighed in relief. "Uh.. I'm done putting on your underwear. Now please put on your own clothes and cover your body quickly." He said in an awkward tone.