Overview: It suddenly happens to the ordinary daily life of mother Satomi Kimura and her only son Shohei. One day,Shohei is in the bath first,but when he sees Satomi naked after he comes in,he suddenly clutches his crotch and begins to writhe in agony. Satomi panics at Shohei's strange behavior. When Shohei removes his hand from his crotch,he finds his penis in a fully erect state. The two are confused by this unprecedented experience. When Shohei asks why he got an erection,he replies that it was because he saw Satomi naked. Satomi is skeptical that her own son would get an erection from seeing his mother naked. To see if it's true,after his erection subsides,Satomi shows off her naked body to Shohei in a sexy pose. Shohei immediately reacts and writhes in agony. Satomi is convinced that,just as Shohei said,it was her own nakedness that caused the erection,and is confused. Even though she can't help the erection,Satomi wants to do something to help him with the agony,and she deduces that the cause is the foreskin that is stretched over the head of the penis. So Satomi decides to pull back the foreskin herself,and uses her own private lotion to make the process go smoothly. However,she realizes that she has run out of it,and is forced to use her own saliva. She wets the tip of the penis with her tongue,occasionally taking it in her mouth,and finally succeeds in pulling back the foreskin,with mixed feelings that she is worried that this is oral sex. However,Shohei begs Satomi to continue the act even after it has been pulled back. Satomi continues the act,wondering about this. After a while,something is released from Shohei's penis into her mouth,and when she spits it out into her hand,she realizes that it is semen. Having experienced his first orgasm and gotten a taste of it,Shohei calmly and naturally asks Satomi to perform oral sex on him. Satomi continues to respond to Shohei's requests for the sake of her beloved child,but eventually...
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