IPX-414: Be mine only while your sister is on a business trip! A runaway drama of "Karen" who grasped the weakness of her sister's boyfriend! Put up with masturbation and sex, have sex many times while there is no older sister, and feel good with two people! Abstinence is lifted and you are absorbed in sex as if you are seeking each other abnormally and greedy! Definitely the best masterpiece in the history of the series! Cheating relationship with her sister! I was serious, not cheating ...! A few days with countless bodies piled up! I can't go back anymore!