旅行で家を空ける両親の代わりに母の親友・愛菜と二人きりの生活が始まった。突如として目の前に現れた爆乳ボディに鼻の下を伸ばす良太。もしかしたら愛菜と何かが起こるかもしれない…。意識しないようにすればするほど、おっぱいに吸い込まれていく視線。胸の高鳴りを抑えきれなくなった良太は劣情に駆られ愛菜の下着を盗んでしまう。それでも愛菜は怒るどころか「私とそんなにしたかったの？」と囁いてきて…。 While his parents were away on a trip, Ryota found himself living alone with his mother's best friend, Aina. Suddenly confronted by her voluptuous figure, Ryota's eyes began to drift. Perhaps something might happen between him and Aina… The more he tried to ignore it, the more his gaze was drawn to her breasts. Unable to control his pounding heart, Ryota, overcome with lust, stole Aina's underwear. But instead of getting angry, Aina whispered, "Did you want to do that with me that badly?"… –
