I go to the art club at university and am dating "Megumi" from the same club. From next month, a female model named "Ms. Maki" will come once a week, and nude drawing classes will begin... I, who don't know anyone's naked body other than hers. Unlike her, she had a great figure and was beautiful. Ms. Maki kept smiling at me a lot during the drawing class... The adult allure that confuses me, who only knows her... The nude model's older sister's other side was a mysterious exhibitionist with a fetish for herbivore dicks. One day, I was called to the art room at night under the guise of individual drawing... She spread her pussy dripping with cum and tempted me. Ms. Maki suddenly kissed me, who was blushing. "Making my dick erect like this... it's cute..." I couldn't control my reason with the overflowing pheromones and the beautiful, lustrous naked body...