アダルトショップで働く陰キャ巨乳女子・上原あゆなと、二次元でしか女を知らない陰キャ男子。家に遊びに来ただけでハミまん部屋着の生マン肉に我慢できず即ハメ！エロ同人で覚えたテクニック全開でマン肉をしゃぶり、舐め、吸い、突きまくり。金玉が空っぽになるまで中出し・顔射を繰り返す、性欲猿化した濃厚セックス沼に2人は完全にハマっていく。

Ayuna Uehara, a shy, big-breasted woman who works at an adult shop, and a shy guy who only knows women through 2D. When she comes over to his house, he can't resist her bare pussy in her revealing loungewear and immediately has sex with her! He uses all the techniques he learned from erotic doujinshi to suck, lick, and thrust into her pussy. He keeps cumming inside her and ejaculating on her face until his balls are empty, and the two of them become completely addicted to this intense sex swamp, turning into sex-crazed monkeys.