A married woman masseuse gets aroused when a client negotiates for her to perform oral sex on his huge dick by saying "show me your big cock" while she insists that sexual services are not allowed at the massage parlor. Despite her initial resistance, she gives in to temptation and secretly pleasures him, experiencing multiple orgasms as he thrusts his massive member deep inside her.

「デカチン」を見せられ「抜いてよ」と交渉してくるお客に人妻マッサージ嬢は「性的なサービスは出来ません」といいながらもフル勃起したイチモツを握らされると欲情してしまい「お店には内緒ですよ」といいながら自分も愛撫されイキまくりデカチンをぶち込まれ何度も何度も絶頂を味わうのであります。