The story is that day I went to visit my girlfriend, unfortunately she was still at work so her older sister Rino Sakuragi joined me for a beer and a chat. While I was admiring the pair of perfectly round breasts and the seductive face of Rino, she suddenly pulled down her top, looked at me with a seductive gaze, and before I could react, she grabbed my penis and started sucking on it eagerly. I didn't want to betray my girlfriend, but the temptations from her sister were too hard to resist.