Fear it

You stop your thrusts in shock, pushing the imp of your dick.

"W-what's, what's happening to me?" you exclaim to the imp, though you don't turn to look at him, still transfixed by your inhuman transformation. Your mistake. The imp slams its body into the back of your head making you faceplant due to your unfamiliar preportions. Face first right into the sticky white cum the small devil had plastered across your wall. In your shock you still had your mouth open, and you recieved a mouthful of still warm demon fluid. The taste seems to tingle in your mouth, then spread through your body, causing tremors as mind numbing pleasure consumes you. The fear, terror and surprise fade away for a moment as erotic ecstasy fills your body, and you squirt a meager contribution into the massive puddle.

The post-nut clarity give you a second to brake free of the liquid bliss, and you try and raise your seed-soaked face off the ground, only for a large foot to slam you back into the white liquid, melting any higher thought. In your last lucid moments you hear a familiar voice far deeper than before exclaim, "Perfect, now I have an imp of my very own".

What is left of your slowly shrinking body is becoming even more demonic as you compulsively lap up your new master's seed, spasming with mindless pleasure.