My girlfriend is having a piano lesson. Her music teacher (Mr. Kuroshima) is elegant, beautiful, and kind. Lately, my girlfriend and I haven't been getting along. She won't even have sex with me. Meanwhile, in front of her is Professor Kuroshima, who is even more beautiful than her. I also asked her to teach me to play the piano. He approached me from behind, touched my hands, and started teaching me. Mr. Kuroshima seems to have very low self-esteem; it looks like if you push him away, he'll have sex with you. I couldn't resist and started touching her breasts from behind… "This isn't good… Waaah…" That troubled expression aroused my lust. *Content may vary depending on distribution method. Special Feature: Click here to view "S-1 Number One Style," filled with the latest releases and promotional products!