Amai Choubatsu: Watashi wa Kanshu Senyou Pet

Hina is locked up in prison after being framed for a crime she didn't commit. There, she meets the cold and cruel warden Aki Myojin. She's at the mercy of his delicate touch and ravishing tongue everywhere: in the examination room, her cell, and even in the visiting room with her lover watching! Bit by bit, her body is disciplined to give in to Aki Myojin!

(Source: Renta!)