While my parents were away on vacation, I snuck into my sister's room and found her standing in front of the mirror, dressed like a succubus and chanting mysterious words. When I tried to talk to her normally, she revealed herself as Princess Eila, the queen of succubi, who had possessed my innocent sister! She then proceeded to suck on my hard cock, claiming that all the manly energy would be absorbed by her. Over the next three days, while our parents were gone, I enjoyed countless blowjobs and creampies at the hands (or rather, mouth) of my succubus-possessed sister.