Walk out and get caught by the boy
From Create Your Own Story
You decide to wait until he is done then walk out pretending not to know he is there and exclaim in surprise. Lucky for you he is one of your students, one you've had a eye on.
"mrs cherry! what are you doing here??" He questions trying to hide his cock from you and failing
"i must have gone in the wrong toilet" you say sheepishly, spreading your legs a little while your hair falls down over your face a little resting on your breasts "you won't tell anyone will you?"
"depends if i get anything for it~" He uncovers himself revealing his cock; to your joy he is packing a real slut buster, his cock is long and thick positively huge for a boy his age