We find ourselves in an exclusive finishing school for young women,  Felicia, the "class clown" is up front with her "DUNCE" cap on, and thoroughly gagged with duct tape.  She's also providing the demonstration for  the opening lesson "All about the nipples".  She happens to have a very nice pair, which have been unceremoniously yanked free of  her kelley green school uniform, the white blouse and bra beneath.  She's fitted onto a special scholastic breast press for the lesson.  The Prof points to a list of things that make the little bud stand at attention - "sexual stimulation", "cold" ; "pain"; "humiliation" and the like.   Sure enough, Felicia's nips are as pert as can be.  THEN... to demonstrate that even the THOUGHT of the listed stimuli can bring an nippular erection, Shanon as asked to come up front,  Since she's not a "Dunce", she gets to stay dressed, but is asked to open up her vest.  Yes indeed, her nips too are straining skyward.