Mark is practically going into turbo mode with his thrusting, unaware he was causing extreme damage to his son's bowls. Blood and pre-cum begin to lube his demon cock better to impale his son, the teen wailing like a madman from pain and pleasure.
"FUCK! FUCK! FUUUUCK!!" Mark roars each word with a hard thrust, the third pump pushing the his shaft all the way in and through his son. The tip pierces through and around Dustin's organs till it was inches away from the back of his throat.
"AAAAAAaaaahhhhh..." Dustin cries out and cums, shooting tiny spurts of cum out his little cock before finally dying. Mark grunts and pulls his dead son off his cock, throwing the bloody corpse against the wall. Cum, blood, and guts went all over the place, making the two demons lavish in the gory sight that is around them.