Des:Ai-san and I are not really siblings. When she was a student, Ai was the stepchild of her fathers remarriage. A year later, after his parents passed away, Ai became my parent. During the days we spent alone together, I began to feel a special love for Ai-san, my only family member. Just as I vowed to make Ai-san happy in the future, my bad friend Shinji approached our family. ``Your sister is quite erotic and beautiful, he said as he began to spend his time in my house.