I splurged on my girlfriend, who won't let me have sex with her unless I create the right mood, so I invited her on a hot spring trip, but to make it harder for me to have sex with her, she brought her sister along, and I was defeated...or so I thought, but her sister is a secret nymphomaniac, and despite her shy demeanor, she seduces me as soon as we arrived at the inn. "Touching me with your hands isn't cheating, you know? I don't know." I felt guilty, but I gave in to her devilish sister's temptation...I was nervous that my girlfriend, Nozomi's older sister, might find out. Her overly sexy face and whispered dirty talk were right before my eyes. I was seduced by my girlfriend's amazing sister...