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My girlfriend is taking piano lessons. Her music teacher (Ms. Kuroshima) is elegant, beautiful and kind. Lately things haven't been going well with my girlfriend. She won't even have sex with me. But then, right in front of me appears Ms. Kuroshima, who is even more beautiful than my girlfriend. I beg her to teach me piano too. She hugs me from behind, touches my hand and teaches me piano. Ms. Kuroshima looks like she could easily resist pressure, and if I pushed her, I could have sex with her. I couldn't resist and ended up groping her breasts from behind... "This... isn't good... ahhh..." Her troubled expression tickles my sexual desire.