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For some reason, Sam thought it would stop once she got pregnant. The Daddy watching her ride her brother's dick thing, she means. At least once she was really pregnant, showing, you know.
But it didn't.
Even towards the end, lanky bird bone frame near full to bursting, she's lurching up and down on Dean's fat cock best she can and begging for his cum. As if their daddy doesn't fuck her enough, he's always watching from the sidelines.
Sam's already-bred cunt is slick and dripping, cherry lipped mouth gasping whatever rushes out, mostly pleas to be kept bred and full, stuffed with cock, oh Dean please, need your cum, need to make you a daddy, please big brother please, be the daddy to my babies-
Maybe it's the plural that does it, but that gets Dean every time, unloading hot and slick and wild into Sam's tight babygirl cunt.
She doesn't realize til she starts to show, bloat not going away. She vomits in the sink while the dollar store test waits silent on the counter. She sits half naked on the pot and calls her brother in. The lock scrapes gently as he picks it.
She holds up the test wordlessly. Dean gulps, and pushes her hand, still clutching the stick, softly down to the counter.
"Okay, Sam," he says. "Okay."
Dad doesn't get back til late and they all know those tests are supposed to be read in the first ten minutes, but the two of them leave it on the bathroom counter. He'll know.
He goes to piss, and once the stream stops, there's the purr of a zipper, then a minutes silence. The door opens quietly, and Dean looks up in reverence. Sam keeps her head to her textbook.
He stands in the doorway, a final harbinger, and Sam rubs her barely rounded belly absentmindedly.
"I'm keeping it," she says, maintaining focus on her high school English assignment.
Her father coughs, and Dean drops the gun he was cleaning, but no one says another word.
And if the baby comes out with dark hair instead of freckles, Dean doesn't ever mention it. He just fucks another one into her, and soon, too soon, Sam is explaining to the towns sole family doctor-cum-obgyn that no, sir, this is not abuse, trust me on that. We prayed for this baby, she croons, massaging her bulging belly.
We wanted Dean Jr to have a sister real close in age, see.