Where did this fantasy come from?

You're on birth control, and there is almost no chance of you getting pregnant but the thought of being used and bred like a sow or a bitch in heat sends you into a paroxysm of orgasmic spasms. It seems to inspire him as well, because he starts to jackhammer his cock into you, slamming you against the wall with fierce intensity.

"Gonna breed you! Gonna Breed Your Fucking Cunt! Fuck! Yes! Yes! Fuck!" he howls as he starts to shudder.

"Yes! Breed Me! Breed Me! Give it to me!" you scream as you quiver with another orgasm, lost in your fantasy of being a breeding bitch for this horny teen.

"FUCK!" he roars, as he slams you one last time into the wall and starts to come. You feel his hot jets of cream spurting inside you, filling you up as you writhe and moan, slinging your hips as you milk every drop from his straining cock.

Finally, both of you slump against each other, panting with satisfied exhaustion. When he pulls out you let yourself slide down the wall until your sitting on the floor, your thighs spread and his semen oozing out of your pussy. He adjusts his clothes and looks down at you with a sneer.

"Enjoy your pizza, bitch. Don't hesitate to call again if you want another." He smirks at you as he turns and leaves your apartment, leaving the door standing open behind him as you start to sob quietly.