It was a tragic day for Andrew's family when a car carrying all the women of his family was hit by a drunk driver. The car had carried Andy's mother Beth, his sister Sally, his daughter by Beth Jenna, his daughter by Sally Marcia. The women were having a girl's night out, hoping to get some action. Their deaths left Andrew and Benny, his son by Beth, all alone. With his female relatives gone, Andrew knew his family line with its incestuous tradition was threatened with extinction. The thought of fucking someone outside his family sickened him horribly and he refused to do it. Andrew also had to deal with increasing sexual frustration. He had never had to masturbate before as he had always had his mother, sister, or daughters to take care of him. He tried to relieve his own tension by hand but realized that masturbation simply couldn't compare to the cunts, mouths, asses, and hands of his mother, sister, and daughters. 'I miss them so much!' he thought tearfully. He wandered into Marcia's old room. When he opened the door, he was met by the most incredible ass his eyes had ever seen. The creamy white backside, dressed in a black thong, swayed back and forth gently and alluringly as its owner bent over, digging through Marcia's underwear drawer. 'Marcia!' was Andrew's first thought. His cock rose to attention immediately, eager for relief at last. 'Eek!' The ass's owner gave a cute, feminine squeal of surprise as he caught his father staring at his thong- clad ass. "Benny?" "Daddy!" "Were you trying on Marcia's clothes?" "Mm-hmm." Benny nodded without meeting his father's gaze, his face red with embarrassment. Andrew marveled at how much his little boy looked like a little girl. His resemblance to Marcia was amazing. "I'm sorry." "Don't be," said Andrew, and he meant it. After so long without his girls, his boy in slutty girl's clothing was the sexiest thing he'd ever seen. "You…you're not mad?" Benny asked. "Not at all. From now on, wear girls' clothes at home if you like." Benny's eyes lit up. "Thanks so much, Dad! They remind me of Marcia." "Me too." Andrew smiled at his son before retreating into his bedroom, the image of Benny's round, white ass still burned into his mind. For the first time ever, masturbating gave Andrew some actual relief. But that relief was only temporary as Benny's ass continued to haunt Andrew's dreams. It didn't help that Benny had started wearing his late sister's slutty outfits. His favorite was a transparent silken nightdress with a very short dress that allowed his panties (when he wore panties) to peek out from underneath. Andrew found it harder to think of Benny as a boy and easier to think of him as a girl. If only he could get pregnant, their family could continue. One day, while watching the TV, Andrew found the answer he'd been waiting for. A report detailed an experimental formula that could alter a man's body, turning his anus into a birth canal and his rectum into a uterus. Not wasting a moment, Andrew got on the phone. Posing as a university researcher, he was able to have a vial of the new formula delivered to his home. The next morning, he poured the vial into Benny's breakfast orange juice. It took every ounce of his willpower to not shoot his load in his pants as he waited for his son to come down from bed. 'In a few minutes I'll be fucking my little girl,' Andrew thought eagerly. He had started to unconsciously think of his son as his daughter. 'In nine months she'll be poopin' out my baby!' When Benny came down in his white tank top and pink panties, Andrew's hair-trigger cock once again threatened to shoot his seed uselessly in his shorts. He had tied his blond hair up into short little pigtails, adding to his girlish appearance. With an unsuspecting "Hi" to his father, Benny began eating his breakfast, innocently gulping down his juice. Finishing his breakfast, Benny got up. "I have to get dressed for school," he said, sounding displeased at changing into boy's clothing. As he turned to leave, giving his father a view of his cute panty-covered bottom, he stopped and clutched his stomach. 'It's working! It's almost time,' Andrew thought eagerly. He surreptitiously undid his fly underneath the table, his dripping cock springing free. The head knocked the top of the table. "I feel kind of funny," said Benny. "You should stay home from school," Andrew said a bit too quickly and eagerly. "I don't feel BAD, just funny. My insides are squirming around but it feels kinda nice," said Benny. Andrew could see his son/daughter's little cock making a tent in his pink panties. Andrew couldn't wait any more. He jumped to his feet, revealing his eager cock, and grabbed his eight year old son. He bent Benny over the table and yanked down his girly panties, revealing the incredible buttocks that had haunted his dreams for so long. He also saw Benny's cute little girl-cock. "Daddy, what are you doing?" Benny asked nervously as his father pressed the head of his cock on the outside of his puckered anus. "Daddy's gonna fuck his little girl," Andrew said breathlessly. "Daddy's gonna fuck his little girl in the ass!" 'His little girl?' Benny thought. The idea of being his daddy's girl appealed to him and he stuck out his cute butt like his sisters often would, eager to receive his father's huge cock. Andrew pushed his way into Benny's ass. Though the formula had altered his virgin anus to accommodate larger objects, it was still so tight. Andrew grabbed his son's hips to keep his balance, the intense sensations in his crotch threatening to make him collapse. "Ooooh…AH YESSSSSS…" Benny hissed in pleasure as the cock made its way up his anal passage to his rectum where, unknown to him, a fertile egg was waiting for his father's seed. "OH GOD YEAAAAH!" Andrew, uninhibited, screamed his pleasure as his seed rushed into his child's bum. All his lust and frustration burst from his loins in liquid form, filling his son's bowels. "Daddy's gonna make his baby girl pregnant. I'm gonna make a baby right in your ass, Benny!" Benny knew that a man couldn't get another man pregnant, but the thought of getting pregnant just like his mom, grandma, and sisters was so arousing that he would happily feed his father's fantasy. "Oh, yes Daddy!" he said, his voice sounding higher and more feminine. "Make me pregnant! GET MY ASS PREGNANT! MAKE A BABY IN MY BOTTOM, DADDDYYYYYYYY!" His little dick let out a huge squirt of semen onto the cool tile beneath the table. After what seemed like an eternity, Andrew's cock finished spewing his seed and softened. Pulling out, Andrew knelt down and smothered his son's perfect ass with kisses, licking up the sperm that dribbled from his butthole. Benny swayed his ass back and forth in pleasure. Afterwards, Andrew grabbed Benny's face and gave him a long, passionate kiss. "From now on, we'll tell everyone your name is Penny, not Benny," said Andrew. "We'll move far away where no one knows us. You'll be my wife, my daughter, and my son and you'll get to wear girls' clothes all the time. Just you, me, and our baby." "Oh Daddy, I'm so happy!" said Benny, tears in her eyes. Andrew and "Penny" moved across the state and settled in a beautiful suburb. Benny wore girls' clothes when he was clothed at all. Andrew home-schooled Benny, though they spent almost all their time fucking. They kept to themselves as an unmarried pregnant person, especially an unmarried pregnant BOY, would arouse too many questions (and people). When they weren't fucking, Andrew was on the Internet or watching television, researching the formula that Benny had taken. When he found out that all tests of the formula had resulted in multiple births, he immediately mounted his son again, cumming inside his ass five times before finally resting. Benny would spend his time lying in bed, enjoying the feeling of his father's warm sperm in his rectum, coating the walls of his anus. He loved how sexy, beautiful, and feminine it made him feel. It wasn't long before Benny realized that his father's fantasy of impregnating him was no fantasy at all. His belly bulged like any other pregnant girls'. His once flat male breasts grew to B-cups as they started leaking milk. But Benny wasn't angry about being knocked up without his knowledge. The girls in his family got pregnant without any complaints. Why should he be any different? 9 MONTHS LATER: Andrew came home from grocery shopping to find his son naked, his bulging pregnant belly displayed prominently. "Hi, Daddy." Benny turned around and spread his ass seductively. "Wanna fuck?" Andrew's answer was, as always, yes. Benny bent down to receive his father's cock. It was an uncomfortable position, but the pleasure he was about to get would more than make up for it. Andrew grabbed Benny's now girlishly-long blonde pigtails like the reins of a horse and pulled his son back onto his cock. "Oh…Oh! OH NO!" Benny shouted. Andrew felt a huge gush of liquid burst from his son's ass all over his cock. "My water broke!" Benny said worriedly. He was nearly panicking, but his father was deaf to his cries. The feeling of anal contractions combined with labor contractions on his cock was far too pleasurable to give up. "This feels so fuckin' cool!" shouted Andrew. "I'm gonna get you pregnant again and again so I can fuck your laborin' ass." "Daddy, please!" said Benny, with tears in his eyes. "The babies are coming." Fortunately for Benny, Andrew hit his orgasm soon enough, spewing his babies with cum as they made their way into the world. When he returned to his senses, Andrew led his son into the bedroom. Benny lay down on his back but Andrew told him to lie face down on his hands and knees with his ass in the air. This was a very uncomfortable position for Benny, but it would make the birthing easiest. Andrew took his position behind his son's sexy bottom. "Okay, honey, push!" said Andrew. "Just like pooping!" Andrew watched in fascination and lust as the first baby's head pushed its way out of its male mother's ass. Benny's anal ring stretched to impossible sizes to accommodate his child's body. After hours of labor, the other child followed. Andrew found the whole process so sexy he came in his pants several times without touching himself. As his son/daughter/wife lay resting on the bed, Andrew inspected his two beautiful, healthy children. They were both boys. 'Hmm,' thought Andrew. 'I'm going to need more of that formula soon.'