"I take it none of you have ever seen an anthropomorphic slime before" is what you think she said, but you're really not quite sure.
A few minutes ago, you and Sid were cutting up, wondering what kind of prank you were going to pull on the substitute teacher, when she walked in.
At least you think it was a she. It was about five foot seven, vaguely female shaped, and made up entirely of a translucent, luminescent yellow goo. As it moved across the classroom floor, it left a slimy trail that must have been slightly acidic, because the floor looked slightly corroded in its wake.
When the slime got to the board, you thought it picked up a marker to write its name. You belatedly realize that the slime morphed part of its hand into a stylus, and literally burned its name into the board.
When the slime first started talking, its voice was distorted but still understandable. But as it continues talking, it becomes less and less discernible.
Now it's "looking" straight at you, and it's asking you something.
"I don't understand," you answer, holding your hands palms up to indicate your confusion.
The slime seems to be getting agitated, and asks something again.
"I still don't understand,' you repeat, starting to feel nervous.
The slime lets out an ear shattering shriek, and morphs into huge blob. When it starts heading directly toward you, the other students scatter out of the way. You find yourself unable to move.
Just as the slime is almost on top you, it gets blasted by a white ray, totally disintegrating.
All eyes turn to the source of the blast. Standing in the doorway is one of the most beautiful women you've ever seen. She's easily six foot tall and statuesque. She has wavy-curly red hair, green eyes, fair skin and the muted points on her ears that mark her as a half-elf. In her outstretched right hand is the source of the blast that saved you from an acid bath, a glowing