My girlfriend has been acting strangely since joining a college club and no longer wants sex with me. Right after she leaves for a club trip despite my objections, her best friend Tsubomi comes to my room claiming she lost her bicycle key. Then she reveals that my girlfriend is cheating and the trip is a lie, before offering to comfort me. I tell myself it will only happen once, but Tsubomi is far bolder and more sexual than her innocent act suggests. Her kisses, blowjobs and incredibly responsive body overwhelm me, and after that single taste I become hopelessly obsessed with fucking her.