Not good

I entered the closet of the art room to give me the privacy to change into my underwear. I had hoped to wear boxers to look better but when I had looked at morning they had all been in the wash, I was **** to wear my dreaded tighty whites. Not ideal and a little embarrassing but something I thought I could deal with. Looking down I felt them loosely hang off my small crotch. I thought nothing of it at the time as I posed before a mirror that had been left on the floor. I thought I looked fine. Without knocking my teacher, a tall woman called Mrs Sharp opened the door to speak to me. She was greeted to the sight of my behind and I let out a small "eek" as turned to face her I covered myself.
"Oh no, these will not do at all!" she said without reacting to my shy nature. "Much too ugly, you must change into a nicer pair."
"B-but all my other pairs are in the wash!" I said, holding my hands up in defence, letting go of my crotch and letting her see the flat area of it. She said nothing but smirked.
"Then you shall have to to model in the nude. Unless your willing to try a spare pair of mine". Both idea's shocked me. I couldn't imagine being seen naked! But being seen in woman's panties felt even more embarrassing!