Son's friend Yū decides to help him out with his career choices but gets carried away by his erect penis and becomes aroused... Although she thought it was just a casual release, he turns out to be incredibly potent, ejaculating multiple times without losing strength! Exhausted after being constantly fucked all night, Yū finally tries to resist but can't help falling under the seductive charm of this mature woman. She finds herself unable to escape the relentless advances of Shinnosuke, both during the day and at night. His insatiable lust eventually pushes her body to its limits...

息子の友達・真司の進路相談に乗るゆう。だが、その最中に彼の勃起チンポに堪らず発情して…。軽い気持ちの発散だったが、なんと彼は何度発射しても衰え知らずの絶倫であった！夜通しイカされ続けたゆうは、さすがに限界を感じてこれっきりと拒むが…。大人の女が放つ妖艶な魅力に憑りつかれた真司は、昼も夜も休む暇なく彼女に迫り続ける。そして、彼の底なし性欲にとうとうゆうの身体は限界を迎えて…。