Don't Laugh at Other People's Sex Lives by Naokora Yamazaki (author), Polly Barton (translator)

Art student Isogai first models for one of his tutors, the much older Yuri, then begins a passionate affair with her. As he gets to know her better, he struggles to understand his own emotions and his place in the world, just as he yearns to be closer to her and for her to share more of herself with him.