I Misidentified My Old Friend for Five Years, and I Became the One in His Clutches

I, the evil female supporting character in the book, slept with the male protagonist for five years. On the eve of running away, he was caught by the male protagonist. He smashed the cup and stared at me with red eyes: "Can you touch my abdominal muscles? I have been practicing secretly for a long time." Me:…… Help, this plot is different from what was promised!