Buy: Treasure (Yaoi) by Riyu Yamakami

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Naoyuki, a sincere and very honest country boy, moves to Tokyo for school and stays with his cousin's family in the city. At first, everybody wants to take advantage of him thinking he's too naive and slow to catch on things. Satoshi, his college tutor, demands to have sex with him in exchange for a payment! But, when Satoshi finds out that Naoyuki isn't as gullible as he looks, he starts falling in love with him!

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