My parents went on a trip, so I had some free time, and when I sneaked a peek into my sister's room, I saw my sister dressed as a succubus in front of the mirror, saying, ``Evil spirits, pledge your allegiance to me...!Shadow Mortis!'' was uttering mysterious words. When I called out to her normally, she said, Hey, you're being rude! I took over your sister! I'm the, erm, succubus princess Ayla!