The twins

Note : This story is completely fictional!

Marissa and Lisa were sisters. They were twins. They look the same, they talk the same, but there is one minor difference. Lisa was born with a penis. This difference might be a big deal to some people, but not to the Kamp family. This family was probably the perfect family. 

Well enough about the family lets get to the twins. The twins were both 20, both were in great shape, and had beautiful blond hair. Their tits were even the same, 34C. They both had beautiful, round asses. Well one day during summer break, they went for a swin, their family being very wealthy, had a full olympic size pool in their backyard. So the girls were swimming and playing around. Lisa thought it would be funny to dunk her sister under the water. Lisa dunked her in the water and Marissa screamed, "Hey, what did you do that for?" Marissa then dunked Lisa in the water, and Lisa also screamed. "Ok, truce," she said getting face to face with her gorgeous twin sister. 

"Sis, do you ever think about, why you have a huge dick, instead of a pussy?" Marissa asked.
"No, I just am glad because I don't have to worry about getting pregnant by some strange guy." Lisa responded, swimming closer to Marissa. "Why do you ask?"
"Oh, no reason," Marissa said. She felt kinda embarassed to give her the real reason. "Ok, thats a lie, I was thinking about what it would be like to have sex with a sister with a penis" She couldn't take it, and she locked lips with her sisters, and thrust her tongue in her mouth. 

"Why, did you do that?" Lisa asked, pushing her away.
"I'm sorry, I can't fight it anymore, I love you and I want your dick inside me." Marissa cried.

"I have been waiting for this to happen for years." Lisa said, while sliding her hands onto her sisters' ass. "I love you, too" said Lisa.
They both kissed deeply and their tongues played with each other. Lisa then slid Marissa's thong off to expose her beautiful, shaved, pussy.
"Oh, that is beautiful, when did you shave it?" Lisa asked

"Yesterday" Marissa answers sliding her hands down to Lisa's ass. "How big is it?" Marissa asked.
"Find out for yourself." Lisa responded as Marissa slid off Lisa's swimsuit and there it was, Lisa's amazing 10 inch dick. 
"Wow, thats gigantic!" Marissa said in amazement.

Lisa giggled. She slid her hands to the back of Marissa's top and untied it letting her beautiful tits free. Marissa did the same and there they were naked in the swimming pool. Lisa looked at Marissa's hot body and her dick grew. Marissa swam closer, their tits were pressed up against one another. Lisa's dick was inches away from Marissa's tight, pussy.

"Are you sure you want to do this?" Lisa asked.
"Yes!" Marissa answered grabbing Lisa's dick and sliding it into her wet pussy. "Oh, that feels so good." Marissa said,"Fuck me, fuck me good sis!"Marissa screamed as Lisa put her hands around Marissa's waist and began to thrust in and out.

"You are so tight, Riss." Lisa said in pleasure.
"You feel so good inside me Lee." Marissa said while her sister fucked her brains out.

"Oh god fuck me harder, spray your hott baby batter into my cunt." Marissa moaned as Lisa continued to thrust her gigantic she-dick into her sister. "I'm cumming, I'm cumming!" Marissa screamed as her sisters' huge donkey dick pounded in and out.

"So am I, I'm cumming!" Lisa screamed as she thrust in one more time, deeper thane ver before, and sprayed her hot cum into her sisters juicy pussy. They both held each other for a few minutes and got out of the pool.

"I have never been fuck ed so hard." said Marissa
"Me either." said Lisa.
That night instead of sleeping in separate beds, they both slept in Lisa's bed, naked. They fucked and fell asleep in each other's arms.
"It's so great to have a sister with a giant cock." said Marissa.
"Thanks." said Lisa.

Next time, their brother comes home early and finds a surprise when he walks into the girls room.