Decline her offer.

"Sorry. I have plans tonight," you reply.

Whether it's true or not, it doesn't matter. You don't want to spend time alone with a girl right now given your condition. This curse could send you over the edge with too much stimulation. What would your teacher think if that happened? You could be expelled... Well, maybe.

She shrugs. "All right. Maybe another time, John."

With that, she smiles and waves her hand. At least it doesn't seem like you insulted her. You make your way towards the door to continue your day. You hope there aren't too many more surprises. This is only the first day of this witch's curse. There's quite a few more to go still.