Akira-sensei wa Dare ni mo Ienai

From : A high school teacher - Ichinose Akira, who is going to marry soon, has a secret. she is a virgin! One day she met her childhood friend Kyou who used to play as a doctor when they were small. He has now become a real doctor and by a chance examine her, and he make a revenge on pranks that she did to him while they were small....!? His fingers, lips, feels so nice--. absolutely she can't say this to anyone...!!