@chenando1: You've pegged Chiyo's semi-consciousness pretty well. Especially the absence of any thought of actually telling her friend (or better yet, her boyfriend) the truth about her "history" with Ookuma. Unfortunately, Igarashi isn't the brightest bulb in the box and is easily bamboozled, like back in chapter 71 when he caught Ookuma in the middle of what he imagined was a confession (and probably would have been if he hadn't interrupted), but confounded to think otherwise by Chiyo's angry outburst. Nagatsuki, on the other hand, probably wouldn't even believe Chiyo at this point if she was told the truth, and will most likely have to suffer her own rude awakening at the hands of Ookuma, himself.