The author knows there are Sonoya fans out there, but he can't keep showing her because she's not supposed to be the selling point of the manga. So he just keeps teasing us.
I wanted to make a joke that I'm interested in these slacking off nationals and would look into registering tomorrow but I'm just too shocked by the depravity my brain isn't working and have you seen that face ? that man's struggle, yearning, and sheer horniness aged him by a decade in the span of two seconds