Her pussy is so tight and hot that you can barely get any of your huge cock inside of her. She struggles, but as you thrust your thick swollen tip in and out she starts to moan and become wet. She moves your hand from your mouth so that she can speak. "Put more in. Stretch me out."
You do as you are told and push more of your huge cock deep inside of her. She gasped and uses her own hand to muffle a scream. You groan, holding her tight. You feel taller than before and your breasts have starts to swell up with arousal, quickly becoming D cups. Your nipples are erect and sensitive as they rub against her own huge tits.
"More, more! I can take it! Feels so good!" She moans into you. She grabs one of your tits with her hand and squeezes it. You moan, milk leaking from them. Maybe you'll like having breasts after all. Your huge cock is somehow managing to go in, as if her body is changing too to allow you. You push in up to the hilt and can see the shape of your mighty dick outlined in her stomach. You pull back and thrust. Again, again, AGAIN. Picking up speed and power. She's so wet now, you feel her spasm and cum around your cock three times. Your breasts are swelling up again, becoming E's, no, G's. They bounce and swing, the heaviness somehow erotic as you fuck her.
She begs for it harder and you deliver. Your large balls swing and spank her. You know that soon you're going to cum...