You do.

"Just cum!" You shout at him, "Cum already!!!"

You can't even tell if you're still defying him and asking him to cum first, or if you're actually begging him to cum inside of you. You're frantically thrusting your hips back at him, but you know for a fact that your body is just moving on its own. Reacting to the building pleasure inside of you.

"You know you want this Casey, you know you want me to fill you up!" He growls, and moves his hand a final time. Letting go of one of your breasts, he reaches down and furiously rubs your clit. Breaking down any final bit of resistance you might have had left.

"Oh FUCK FUCK FUCK! Kris!!!" You cum. Your pussy walls clamp down on him as he thrusts right up, the head of his cock kissing the entrance to your womb. Oh and it feels glorious! Your head blanks out as you surrender to the sweet pleasure and cry out the demon's name.

Just as you start coming down from your peak, you feel it. Kris grunts out your name and cums inside. You feel his cock jolting as it sprays out bursts of semen, in much greater quantities than possible for a human being. You feel it fill your womb. And you cum again.

After what feels like an eternity, Kris lets go of you and pulls out. Your pussy releases his cock with a 'pop', and his excess cum runs down your inner thighs as your knees give out from under you.

So much for keeping your dress clean.