最低最悪のセックスになればいいと思っていた――四十歳独身、デザイン事務所社長の実令は、友人の結婚式でかつてのビジネスパートナー・拓也と再会する。相変わらず熟年夫婦のようだと周囲に冷やかされるが、四十ともなれば秘めた思いを隠すのもすっかり上手くなった…はずなのに、拓也に触れられたら抗うことは出来なくて？酸いも甘いも噛み分けた、セクシーすぎるハイスペイケオジ×イケオジの恋のネゴシエーション。令和NO.1アーバンBL降臨！ "I thought it would be fine if it turned into the worst possible sex"――Jitsurei, a 40-year-old single man and president of a design firm, reunites with his former business partner, Takuya, at a friend's wedding. As always, those around them tease that they act like an old married couple, but at 40-years-old, he should have become completely adept at hiding his secret feelings... or so he thought. Yet, when Takuya touches him, he can't resist? A negotiation of love between two sexy, high-spec handsome older men who've tasted both the sour and the sweet.