Tonari no Seki-kun ep 19

I love this series. Couldn't give up my 10 minutes of joy even to marathon Bleach.  This episode continued the development of the relationship between Yokoi and Seki we saw last week.  Yokoi has now fully entered into Seki-kun's world, and openly (or as openly as possible in the middle of class) participates. Seki is accepting her participation without question too. But why did Yokoi expect him to wear the glasses afterwards? Surely she should have known this was just another way to pass the time?