My stepsister, who eats too much meat and has poor grades, and I, a diligent but virgin, engage in a private tutoring arrangement with her in exchange for my studies. HUNTB-104

My stepsister, who had never studied properly, suddenly announced she wanted to go to university. At my stepmother's request, we started tutoring her, but it was simply impossible! She was so stupid. When we asked her to give up the idea, she actually offered to teach me how to make love in exchange...