A beautiful woman named Kouzuki-san and her junior coworker, both endowed with natural big tits, find themselves sharing a room during an out-of-town business trip due to limited hotel availability. Despite their initial discomfort, they decide to spend the night together. As the nervous cherry boy struggles to contain his excitement, Kouzuki-san senses something is off and asks if he's a virgin. From there, she succumbs to his unspoiled passion and initiates a wild fuck session that leaves them both exhausted but still craving more. Even after checking out, the former virgin can't get enough of Kouzuki-san's massive breasts and continues to pound away at her until they finally part ways.

天然巨乳な楠さんとその後輩男子が二人での出張に。その夜、ホテルが一部屋しか予約されていなかった…仕方なしに一つの部屋に二人で泊まることに。相部屋で一晩過ごすことにあまりにも動揺している後輩男子に楠さんは「童貞なの…？」そこから童貞の熱量に負けて筆おろしセックス…から始まった夜が明けても尽きない性欲、童貞卒業したばかりとは思えない凄絶な性交に…チェックアウト寸前まで元童貞にイカされ続けた巨乳先輩。