Twilight and her classmates surely had a lot of fun observing the elastic properties of the New flexible fabrics created by their new professor. Sadly, using her and her panties as didactic material…  
at least twilight had her fun
 
twilight p.o.v
 
Just as she expected it, some nibbling and licking could not be lacking for the part of her students, who took full advantage of the experience recording every sensation, smell and curve of that little butt, inside of their memories. overcharging their senses and their over stimulated minds. Above all, she was pleasantly surprised when that little wet spot began to grow noticeably right in the center of the fabric before the attentive look of the class.  
And to ensure the greatest humiliation for the little smolder  
All this happened while a tiny tentacle of her magic bothered directly the fleshy walls of her tiny slit, while she tried with all her might not to cry…  
and failed miserably
 
“Maybe it’s time to order some clothes like those for my little barb” she though

imported from https://derpibooru.org/images/2001667