You're Muichiro's Twin sister. Muichiro was playing with His origami Then He ran Trying To catch it. The origami Flew upside You so He suddenly Muichiro bend down and His Head lifted Your skirt and grabbed Your thighs Trying To catch The origami.

__"Oh no! My origami I can't catch it."

He was sad while You was blushing He was under You and His Head lifting Your skirt. He didn't found it weird because He was Too innocent.