Done for now with Murray, Mr Scaftie turned to Gavin. “Now, Gavin, the serum should have had enough time to work, so please help me illustrate to the class the male genitals during sexual arousal.”
Turning Gavin to face sideways, the teacher, trying to act as professional as he could, started caressing one of Gavin’s nipples in an attempt to arouse the boy for the demonstration. The class watched as Gavin’s cock grew from flaccid to erect. He could hear a few of the boys snickering as Mr Scaftie started roughly handling the engorged cock, pointing at the different parts as he lists their descriptions like the glans, shaft, frenulum. Gavin could do nothing but stand awkwardly and suppress the sensations the teacher’s groping was causing. He was then suddenly mortified when his teacher used his gloved hand to give him a handjob in order to show the students an ejaculation. Despite attempting to use all his mental strength to hold on, it wasn’t long until Gavin came, spraying the entire class with cum. The class erupted into disgusted screams. One complained that she got some in her mouth.
After what felt like a lifetime being used as a living anatomy diagram, Gavin felt a sudden surge at the base of his crotch. Then, his 6.7 inch dick began to twitch slightly, as if reacting to an unseen force. Then the transformation quickly escalated. The base thickened, the skin stretched taut, and veins became more prominent, pulsing visibly. Inch by inch, his cock elongated, the growth both mesmerizing and surreal. The class watched in stunned fascination as it reached an improbable size, far beyond anything humanly natural. By the end, it probably reached 20 inches, 10 in diameter, and was finally in proportion with his giant nuts. A fountain of precum ran down the shaft and all over the carpet around him. The most startling moment came when it began to move independently, curving upward like a cobra rising to strike. Gasps filled the room as it flexed experimentally, curling and uncurling with eerie precision. The “mouth” at the tip of Gavin’s dick flared slightly, mimicking the dexterity of an elephant’s trunk. It swayed gently in the air, its movement impossibly fluid, like a living, autonomous appendage before it occurred to Gavin that he was controlling it unconsciously.