A female teacher, Yuu, finds a male student crouching on the side of the road at night. "What's wrong?! The last train has already left!" Yuu can't help but invite him over to her house to talk to him. He tells her that his friend gave him an erection drug and he can't stop ejaculating no matter how many times he does... Yuu pity and hope for the rock-hard crotch in front of her. He begs her to show him his body, and Yuu, who is weak to pressure, goes along with it and makes him ejaculate with oral sex and penetration. However, the sexual desire of a teenager knows no bounds... She keeps making him cum all night long with endless sexual intercourse.