Mark drank the vial and waited for his transformation to start. He soon felt a sensation as his muscles started to grow a bit as green scales started to cover his body. His back soon started to stretch and expand soon 2 rather large appendages were showing as he soon grew wings. He soon felt his spine grew longer as a tail started to stretch getting longer and longer with green scales his hands soon started to change as his 5 fingers changed into sharp claws as scales spread. His face soon started to change as his hair soon receded back into his scalp as large horns grew out his face stretched into a green muzzle for the dragon. His feet started to change as 2 of his toes soon merged to create 4 talons as green scales spread stretching which gave him more height, his muscles were becoming bulky and toned which he liked. Mark thought that was all until he felt sensations on his groin he looked as the green scales soon reached his penis it soon became green and dragonish as it soon became rock hard standing straight up before growing 5 times the size of when he had his human one. He soon touched his penis as all kinds of sensation filled him he grasped it and saw that his hand was just big enough that his middle and thumb tips touched each other he soon fell back onto his now smaller bed and started to masturbate he soon hit the spot as cum shot out like a volcano erupting hitting the ceiling as cum soon covered the tip of his penis soon droplets of his cum covered ceiling dropped like rain which Mark opened his mouth and tasted his treasure of white and started to lick as his forked tongue tasted the delicious cum until he hears the door opening as his girlfriend started to enter. He remembered that they wanted to hangout and it was his place they decide to hangout at.