After a drunk confession on a family trip you both decided to try it out as adults to see how it felt. You waited until you were both between relationships before inviting each other over after work for some casual sex. It was awkward at first but you soon found each other close as lovers beneath your sheets.
One year later and she's due to give birth to your twins any day now. You haven't decided on marriage yet, her new boyfriend was obviously a little skeptical of the whole arrangement, but you were both in total agreement these babies were going to be a part of your life no matter what, coparents or not.
You couldn't wait to hold her hand when she finally went into labor.
She has been riding you cowgirl style for a while on this beach...
No one seems to have noticed because of careful towel placement...
She is using the excuse that she's applying sunscreen to your chest...
No one her knows your cock is buried to the hilt in her, or that she's your little sister...
You can't take it anymore, you cock throbs and seed inside your nuts begin their journey into your sisters deepest place.
She feels the throb and looks you in the eye, as trillions of sperm infiltrate her body, penetrating her defences, where they will destroy her delicate frame forever...
"bro..." She whispers quietly, just in time for the final spurt of cum to travel out of your cock and vanish into her body, "did you just cum inside me?"
“Nnnggg fuck, bro! Your baby’s getting pretty big. I’m not even full term yet and it’s getting pretty heavy. I’m not sure if I can agree to my promise to give you a few children. I had no idea your babies would be so huge!”
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