男友達みたいで気を使わない同じ大学のクラスメイト女子。いつものように遊んでいると、不意に見えた下着と体が想像以上にエロかった！？ムラムラが我慢できないボクを、クラスメイト女子は普段見せない乙女顔で見つめてきて…気付けばお互い朝までヤリまくり！その日からどんどん女らしくなるクラスメイト女子に興奮がおさまらず、今までの関係が嘘みたいにエッチを重ねていく二人！

A female classmate from the same university, someone I feel comfortable around like a male friend. We were hanging out as usual when I caught a glimpse of her underwear and body, which was far more erotic than I imagined!? I couldn't control my lust, and my female classmate looked at me with a girlish expression I'd never seen before… Before we knew it, we were having sex all night long! From that day on, I couldn't contain my excitement as my female classmate became more and more feminine, and we continued to have sex like never before, as if our previous relationship was a lie!