Mark and Dustin while still feeling overwhelmed by lust and heat let the demon's cum enter their skin. "YESSSS!! YESSSS!!" Mark screams as he feels himself being filled by hellish power. His pecs completely fill up his shirt as he tear it off in one motion, exposing his growing form. Right away he picks Dustin by the back of the head and plunges his dick in his mouth. Dustin tries to keep up as he himself starts to be affected by the demon's essence. He pulls out a loud moan as his skins starts to grow darker and darker until it reaches a dark shade of purple. He then slowly grows taller as he gets used to Mark's dick, getting better and better at sucking it. Mark has never felt anything better, he softly moans and lets Dustin do his work on his cock and then feels it growing. slowly inches upon inches add up to his cock, with Dustin deepthroating it further and further as Mark now scream in pleasure. "GIVE ME MORE DUSTIN!!! MOOOOORRRRREEEEE!!" Dustin then raises his eyes and looks directly at his father, he looks devoid of humanity and only driven by lust and greed for more cock. Dustin then starts sucking faster and faster as Mark pulls his head back and starts exploding with growth. His 9 inches cock suddenly reaching 17 inches and 6 inches thick. His biceps getting bigger than watermelons as his form rises higher and higher. His skin finally turning a demonic red. "YESSSS MAKE ME BIGGER!!! MOOORRREEEE!!!" His eyes now burning with hell fire, 2 feet high horns burst out of his forehead. He looks down at Dustin sucking him. "TAKE MY SEED, TAKE MY POWER!!!" He rams Dustin deep into his cock as shots upon shots of thick burning demonic seed burst out of him. Dustin hungrily taking as much seed as his unholy body can hold. Suddenly, Dustin's body starts convulsing as he moans and screams in lust. The pain and pleasure overwhelming everything. A mass getting more and more noticeable on his back. Six long slender tentacles finally emerge. He then screams in madness. "YESSSS HAHAHAHA YESSSS" As he feels himself turning fully into an Incubus. A demon of lust ready to corrupt people further and further to the ways of hell. He looks visibly older also, his body matured and more athletic. Smilling with his now sharp demonic teeth. He gives a hungry look at Ty.