Refined on the outside and filthy within, Kokoro Asano attempts deep cervical pleasure training for the first time. A monster cock and massager slowly develop sensitive spots at the very back of her vagina. As the process advances, she cannot hide her shock at unknown pleasure. Trained, edged and then suddenly forced to cum without mercy, she reaches orgasms several levels beyond anything before. Her shameless body enters a trance beyond climax, brain flooded with pleasure, until she becomes completely addicted to huge cocks.