She tries to ignore it

Taking a deep breath, Miss Sullivan tries to ignore the missing button, silently ushering the students to their seats and taking her place at the head of the class, clearing her throat.

"Right, now that we're all here, we can finally begin the class," she said slowly, sounding far more confident than she actually felt. "I'd like you all to pull out your books and turn to page 85."

The students all do as they're told, some of them more reluctantly than others, and Miss Sullivan can feel a few of the boys eyes on her cleavage, as they do.

Of course, that's not enough for you. With a slight smile you let another button fall from her blouse, the top now hanging open enough to give the students a brief flash of her white bra, before she can pull a hand up to close it across her chest again.

How could this possibly be happening? Half the buttons on her shirt missing she'll have to stop the class, but how could she possibly explain it to Miss Nolan?