Your body shakes and twitches as the cum inside of you bubbles burbles and squishes around inside of your guts. You can feel it- trying to shove itself into you, to be absorbed by your body. You curl up in a ball as a mixture of pain and pleasure pushes through your body.
Eventually the demonic seed manages to get absorbed into you, shoving through intenstinal and stomach lining, distributing itself into your blood stream.
You can feel your skin taking on a dark tone. Its hue slowly shifts from its current color to pitch black. As this hue shift transpires, you feel your skin becoming smoother, squishier, glossier.
Your body pulls in on itself, shrinking and contracting. Your arms pull into you, as do your legs, slowly shortening as your cock and balls start to grow and grow and grow.
As the corrupted blood reaches your head, you feel your mind becoming dull, stupider, and then waves of euphoria start to pass over your mind. You can feel your identity beginning to be overwritten, subsumed by cock. Cock cock cock. Its soon all you can think of. Cock and corrupted seed and fucking holes and getting swallowed up and holding people tightly in your throbbing pulsing grip.
The shape of your cock shifts as it grows, it becomes flatter at the end, big fat nubs of synthetic flesh forming in a ring at the flattened tip. A medial ring comes into being halfway along the shaft.
Your arms and legs are soon gone, and your cock bobs up and down above your head. After a few twitches and throbs, it lurches against you, slapping against your head and torso wetly. Your body takes some time being pressed up against the cock, but it does eventually manage to slowly squish you into itself. All you can do is smile stupidly as it pulls you in, eating you up, incorporating you into itself just as your body did with the satanic seed.
You feel your consciousness melt as your cock finishes eating you up. Your consciousness spreads throughout your new body as you become cock. You no longer think of your body as of what was eaten, but as of your cock. Your body is your cock. You are cock. You twitch and throb, enjoying how it feels to be a massive snake-like dildo.