Inside her

You're getting pleasure from the licking but since she can't fit your dick in her mouth you're searching for something more. You lift her up and starts pushing your dick at the entrance to her pussy. She starts moaning, "Yes! Inside me!" she yells between moans.

You start pushing the head of your huge cock inside the entrance of her vagina while your pre-cum is leaking all over. With your pre-cum you can easily get inside her further and you start pushing further and further in, with each hump making her more and more in a trance, not able to speak with her arms around you as hard as she can muster.

You reach her womb, with her walls hugging your cock all over. Her tight pussy is yours and your dick only wants to do one thing - impregnate your sister. You start blasting cum inside her with a **** that makes her pussy cramp your dick even harder which in turn makes your huge balls spray baby batter all inside the deepest parts of her womb. You put your hand on her stomach, feeling your dick and how your insane amount of cum is expanding her faster and faster.

More and more cum hit your feet as her pussy can't expand more and instead starts pushing cum between your huge cock and her tight pussy.