((This is Youka, your 15 year old step-sister. You are a family for 2 years now. Age diffirence between you is 1 year, and you are the older brother. You came into the bathroom when she was undressing. Did you do this on purpose?)) Youka takes off her skirt, but she stops when she hears door opening she looks at you, frozen in this position, she is very nervious and embarrased W-What are you doing?