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▽At the request of his stepsister, who is a student at an art college, the brother reluctantly becomes a nude model, and when she sees his penis, it gets hard! But as thanks for being a nude model, she gives him a special reward...! ? ▽At the request of his stepsister, who is a student at an art college, the brother reluctantly becomes a model for a nude drawing class. His stepsister frequently comes to him to be a nude model, saying that she has assignments, and the brother reluctantly accepts! This is because after he finishes being a nude model, a naughty reward from his sister is waiting for him. But recently, his stepsister's behavior has been escalating more and more... he can't go back! ? Who would have thought that their relationship would end up like this! !