All in the Family

 

Sam had been adopted when he and his sister Tammy were young.  Tammy, the biological child of his adoptive parents, always was a flirt at school, and even flirted with him sometimes.

 

As the years went by they grew really close to each other, they had even chosen to go to the same college together, even got an apartment together.  Their parents thought nothing of it, after all, they grew up brother and sister.

 

Sam got home from school to find Tammy on all fours in his bed, her heavy tits hanging out of her tiny spandex top she would wear to work out in, her shoes and white stockings also on. 

 

"Hi baby brother!  Sister needs some of your big cock!" Tammy giggles, wiggling her ass invitingly.

 

 

Smiling, Sam strips down and slides the tiny slip of soaked cloth to the side of his sisters big ass. He runs his fingers along her wet slit, causing her to moan in pleasure.  Licking his fingers, he slides his cock inside her wet pussy, she whimpers softly as he grabs her arms, and proceeds to fuck her hard.  Tammy cries out in pleasure, her breasts almost hitting her in the chin, her ass bouncing back onto her brothers cock.

 

Grunting loudly, Sam pummels his sisters pussy with deep strokes, knowing just how she likes it.  She cums almost immediately, her pussy milking Sam's cock, screaming loudly as her body jiggles with Sam's thrusts.

 

When they had moved in together, it had taken a month before they fooled around.  They had both gotten drunk and talked about their relationships, when it dawned on them.  They were brother and sister by adoption only.  After that, they fucked like rabbits.

 

They both had decided last month that she would no longer use the pill after college.  They would tell Mom and Dad they were going to marry and have children once she got pregnant.  If she was already pregnant, they really wouldn't be able to stop them.

 

"Here it comes Tammy, brother is gonna fill your pussy full of cum!!!"  Tammy moans and squeals in pleasure as Sam's cock throbs inside of her, her pussy milking it, and the feeling of his cock spurting inside of her, flooding her pussy sends her over the edge again, cumming hard.

 

Falling face first onto the bed, they both catch their breath, kissing and fondling each others bodies. 

 

They were keeping it all in the family.