Despite having a girlfriend, a nude model only showed her vulva and smiled at me during a sketching class, displaying her wild, mature womanly side. (Maki Izumi MVSD-654)

I'm in the university art club, dating a fellow club member named "Megumi." Starting next month, a female model named "Ms. Maki" will be coming once a week for our sketching class... I don't recognize any other nude model besides her. Unlike her, she has a fantastic figure and is incredibly beautiful. During sketching class, Ms. Maki only smiles at me... Her mature aura, which I only know, is captivating... The nude model's other side is a mysterious exhibitionist woman who has a huge fondness for herbivorous penises. One day, under the pretense of a personal sketch, I'm called to the art room at night... She opens her dripping, voluptuous vulva, tempting me. Ms. Maki suddenly kisses me as I blush. "It's so cute that your penis is this hard..." Unable to suppress my reason, I'm drawn to the overflowing pheromones and her alluring nude body...