[Relato] Juego de bastardo

You are going to have to develop a good resistance to sex, but feel my sister's mouth on mine... I did what I could not to lose that spectacle... I looked at her attentively, and almost panic was written on her face, total surprise, opened her eyes like plates, and started to moan, received all my discharge full in the mouth, when I thought she was going to choke with the cum, swallowed it all...

Josefina: Piece of animal... When did you last jerk off?
Me: Monday...
Josefina: And do you still come so much since yesterday...???
Me: Yes, obviously, I kill myself jerking off... that's nothing... look
Josefina: You're still hard like a son of a slut... Can you make me cum?
Me: Want to bet?
Josefina: What do you want to bet?
Me: If you don't let me come, I'll leave your belly open and eat it with relish...
Josefina: Good, then. It's the safest day today... And if you lose?
Me: If you lose, you decide...
Josefina: If you can't do what you said, take my girlfriend Caty...
Me: There is no dilemma for me... Total, I know that you'll die of jealousy if I make you cum...

Then she got on top and lay down on her back, spread her legs a little, and when I looked, her outer labia were completely flooded... the clitoris protruded like a simple button, so I didn't need any kind of preparation, I just rested it and started pushing slowly...

I'll try to explain this as well as I can...

While putting my cock head into her pussy, the humidity and heat were incredible, it slid in, the muscles tensed but gave way to the pressure, my sister's face was a work of art, her eyes locked onto mine, her mouth open mute tried to say words that didn't understand, suddenly she bit her lip and felt her acceptance... I wrapped myself around her legs... and started pushing, the inside was burning, I could feel every fold, every inch, every milliliter of fluid that flowed out of her soaked my cock and it felt beautiful, with a simple push, I reached the base, I could feel with the tip the bottom, the mouth of her uterus...

Josefina: It's very big, it's very big you're burying your coxal bones... it hurts... it hurts, for God's sake, you have enormous cock but if you stop I swear to you that I'll skin you alive with my nails... keep going... keep going like this... ahhhh ahahhhh my uterus... my uterus feels so good...

Me: You don't know how big it is, feel it...

Josefina: If you can't come out of there, take Caty...

And then I continued to translate the rest of the text.