The tricky part was that each would only burst from a specific wavelength of light, give or take five percent. Even that wouldn’t have been too hard...to figure out with the various equations, based on the different ways the light reached where we split off the beams. But this wasn’t to be a trivial lab exam. Those testing us needed to increase the difficulty of the lab to challenge us. Being a foot and quarter taller than Fran, I was doing the adjusting and placement of the objects we needed.. The other girls all gathered round to watch and within seconds semen started spurting from my cock, the first jet landed at my feet but the second went about two metres, one of the girls had to jump out of the way crying out "e-uwww" as she did. Most of the girls were wide eyed as Kate kept stroking my cock until there was a line of cum splatted on the locker room floor, once I finished Kate wiped the last drop from my cock with the tip of her finger and put it into her mouth. The girls. However, I saw Samantha mouth, ‘Kill it‘ to me, so she must have determined or figured out that a guitar riff was required after the chorus.After her second cry of, ‘Alone!‘ I closed my eyes and let my fingers do the talking on my Silverburst’s strings for thirty-five seconds. During that short guitar solo, I felt complete peace and pure unadulterated joy. I vaguely recalled hearing Cathy’s drums and Paul’s bass guitar, but simply feeling those incredible sensations from my fingertips was. We made it of oak, so that if she ever took it home it would match. We also gave it adjustable feet to fit on uneven floors.Marcie came home and helped us adjust it according to what she had learned. It sloped slightly to accommodate Julia's stance and to permit easy access. We made that slope adjustable too. Marcie made a great cushion and cover.We completed it that night, but I didn't get the finish done for several days. Dad always insisted that you do work like that during daylight.