There's a full class inside

Anna couldn't cover up because of the head! She froze. "Oh if it isn't the little streaker that's been skipping classes" said the teacher. Anna gulped. To her surprise the teacher laughed. "Don't worry about it. This little room is not the normal sex ED room so I understand your failing to find it and want to get set up before the class got here. I'll tell the head it was just a girl wanting to be the model for my sex ED talk". The teacher was a young woman of about 28 and was smiling she saw the rest of the class slightly embarressed but non gave nasty smiles or laughed. "Please dear, I know streaking is the last thing you wanted, I expect that why you gave it, but please take off the head and give me your name so I can sort out this confusion." Said the teacher. Anna froze. What would she do? If she went along with it she would not get in trouble for streaking or missing classes but she would have to tell the teacher and the class who she was and expose her identity.