Man's best friend and a little extra

Taking out the dildo that was shaped like a dog's dick, with a massive knot, purple, with a weird sort of tube and pump on the bottom of it, John frown; squeezing the pump a little too strongly, something squirts out of the tip of the dildo, making him jump.

Recovering from the surprise, John finds that his belly is jumping for joy and that his pussy was already drooling at the thought of using the dildo on himself.

Resting on the bed, he positioned the head of the dildo on his entrance, rubbing the clit with it a few times before slipping it inside--it was a very easy insertion and the thickness was just right. He began to fuck his pussy with the faux-cock, reaching just deep enough to feel the knot on his vulva; something about that thick thing pounding against him excited John to no end, so you fucked himself harder and faster, head swimming with pleasure.

Then just before he was about to reach climax, he managed to push past the knot, feeling locked in place. Taking the pump in hand and riding out his orgasm, John vigorously squeezed on the pump, feeling something shooting up into his belly. An invisible switch flipped in his head as he kept on squeezing the pump, over and over, filling his belly even more until there was nothing left to pump into himself.

He enjoyed the slight bulge of what he guessed to be fake cum, locked in place by the knot. After a while, he waddled over to the toilet and eased the dildo out, waiting for it to drain out into the toilet.

Going back to his room, he put the dildo down and wondered what he should try next.