Ty kept his gaze on Mark and reaches his hand out, shooting a small cloud of pink mist into his face. Quickly his body starts to pulse and grow, Mark's skin becoming a dark shade of purple while his muscles gain mass.
"AAAAAAAHHHH MY BODY FEELS SO GOOOOD!!" Mark yells out as the corruption sends waves of pleasure through out his body, pulling out of his son to watch his cock grow 18 inches long and 5 inches thick. "OOOHHH YEEESSS!!!" He grabs his shaft and strokes it during his transformation, pre-cum shooting from the tip as he picks up his pace. Dustin lays on his back and watches in sheer lust and fascination.
"O-oh daddy you're turning into a demon!" Dustin moans out as he strokes his small cock, the site of his father's new corrupt self send the teen into a mind-broken state of sex and passion.
"YYYEEESS!! YYEEEEESSSS" Mark roars as his feet become demonic, a long thick tail grows above his rear and finally 2 foot long horns grow from the top of his head. Letting out one final roar, Mark cums all over his teen son, drenching him in his demon seed. "DRINK IT UP, MY SON! DRINK MY CUM!"
"Mmmmm it taste so gooood daddy.." Dustin moans as he starts swallowing mouthfuls of thick, grey semen, reaching his arms up to stroke his demon father's huge cock while gulping down his cum.
In a surprise fit of rage, Mark grabs his son and impales his cock onto him, groaning with pleasure. "O-OOOHHHH DADDY FUCK ME!! FUCK MY ASS DADDY OHHH I ALWAYS WANTED THISS!! I WANTED THIS SO FUCKING BADLY!"
"SHUT THE FUCK UP YOU FUCKING SLUT!" Mark roars into Dustin's face, his demon breath only making his son even hornier. "F-FFUUUCK YOUR ASS IS SO TIGHT! FUCKING TAKE MY DEMON COCK, SON!" He pumps into his son hard, the teen's stomach bulging from the huge shaft that was inside him.
"AAAAAHHH YESYESYESYESSS!!! FILL ME UP DADDY! CUM INSIDE ME AND FUCK ME UP!" Dustin was in extreme pain but didn't know it, his mind was too corrupted and process that pain into pleasure. Ty watches and strokes himself, wondering what the father will do to his dear son or should he intervene.