Lu Huaizhun and Lu Linwan were known to be bitter rivals in their class, and they were notoriously incompatible, not only because of their academic rivalry, but also because they didn’t like each other. But no one knows that in private, they often go in and out of each other’s homes to have s*x with each other. Lu Huaizhun: Other people’s girlfriends are twisting their boyfriends’ dicks in bed and screaming vigorously: “Ah, my husband’s d*ck is so big, it makes me feel so good.” My girlfriend is different. She twisted on me and asked me vigorously: “What is the answer to the last big question in your math test paper?”