A dark day for a girl and a middle-aged man who is aroused by her gigantic J-cup breasts, which are overwhelming even through her uniform. The girl in uniform is not even aware that she is being subjected to lewd acts, and does not understand the importance of creampies. Since morning, the sticky semen that has been building up in the depths of her vagina has been poured into her again and again. Eventually, the girl gets used to the act, and the initial "strange sensation" gradually changes into "pleasant sensation."