Hatsukoi ga Minoru Toki

From fictiondb: SHE WANTED SOME POINTERS... Catherine Harris can't think of a time she wasn't in love with Luke Van Buren. Unfortunately, he's too stubborn to see it. He treats her like a kid sister and clearly doesn't see her as a woman...with needs. Determined to get her man, Cat tells Luke she wants to meet Mr. Right -- with his help! HE WAS THE PERFECT TEACHER... Luke can't believe his bad luck. He's watched out for Cat for years. Now that she's older and gorgeous, the feelings he has sure aren't brotherly! So when she asks him to teach her the art of seduction...well, he's more than a little reluctant. But when could he ever say no to Cat?