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Teresa was comfortable talking about her periods with her dad. Too comfortable, to the point that she would show him her panties when her period started. That was the signal for her father to comfort her with his cock. Their favorite place to do it was her bedroom. The bed smelled like his daughter, and cleanup was easy after they finished. He knew it was wrong, doing his daughter at the time when she was least likely to get pregnant and doing it for months on end, but his cock craved her tight little pussy. He had helped her through so much, and wanted to make sure she grew into a healthy young woman. A regular dose of semen was necessary for that.

They looked out the window of Teresa's bedroom into the backyard. He had built her a clubhouse that was supposed to last her until high school. It only had one room, but that one room was spacious and could hold plenty of things for Teresa and her friends to play with. Blowing in the night breeze, Steve noticed that his daughter had put up an original flag outside the clubhouse. It had a pale pink background with a Rorschach-esque red blotch in the center, made by pressing a paintbrush against the center of it and seeing where it went. He had never noticed it until now, for Teresa had only put it up this afternoon.

"What's the flag?" asked Steve.

Teresa was grinding her pussy against his cock. They weren't going to have penetrative sex tonight, saving that for another night. Her warm and sticky love juices coated his cock as she rubbed her bare slit up and down across it. This is what they liked to do, along with blow jobs, when Teresa wasn't on her period. She felt how hard her dad's cock was beneath her pussy, and knew when it was getting ready to blow.

"I'm only letting my friends into the club if they've had their periods," said Teresa.

"Why'd you do that?" asked Steve.

"Because if you haven't had one, you're just a kid," said Teresa. "That makes me an adult."

Hearing that from his daughter, who still liked playing with her toys and getting ice cream, that she was an adult made his cock throb. The contrast of her innocent body and desire to be seen as an adult was driving him wild. Steve's cock titled itself upward beneath his daughter's pussy, and launched his load into the air. It landed on her chest. His cum dripped down, leaving a slimy white trail as it made its way towards her belly button. Teresa thanked him, continuing to grind her pussy against his dick. She gave him a kiss on the cheek, telling him that she couldn't wait until their next time doing it. Steve left her bedroom, and returned to the master bedroom, where his wife was asleep. He slid into bed, careful not to wake her.

A few days later after school, Teresa was inside her clubhouse. She had found a pile of unsold calendars dated to the previous year. She was more interested in what was on the upper half. A collection of uncensored naked men, with their cocks in various states of hardness on display. She took a particular interest in the May man on one calendar, and wanted to show it off to her friend. Steve was finishing the adjustments for Teresa's science fair project when he opened the garage's side door and walked around to the clubhouse. The red-splotched flag was raised, signaling that someone was inside the clubhouse. He bent down to take a look.

Teresa had pinned one of the calendars to the corkboard along the wall of the clubhouse, with the boner of her favorite man springing free. Standing beside her was a friend from school. Steve had recognized her from a school play. She had said her name was Jimena. Steve recognized her from the laser tag game. She was one of the players on Teresa's team, and covered for her while she was sucking his dick behind one of the barriers. She had tanned skin and brown hair, with eyes that looked through him and a cheeky attitude. What Steve noticed the most about her, from this angle, was her big butt for her age.

She had a big, soft ass for her age, and the bottom of her ass cheeks were hanging out of her panties. Both she and Teresa were wearing only their panties and their shirts inside the clubhouse. Steve noticed the slight bulge of a tampon showing through both of their panties. He placed his ear to the window and listened in on their conversation. His cock was already starting to stiffen, just from seeing their panties so brazenly on display.

"These guys are pretty hot," said Jimena. "They make me feel strange in my panties."

"That's why I wanted to show you," Teresa said. "You've been telling me about your periods, so I know something that'll make you feel better."

"Touching yourself?" asked Jimena.

"Yeah. Replace the bad feelings in my crotch with good ones," said Teresa.

Teresa put her hands on the bottom of her shirt and lifted it up. She wasn't wearing a bra, and neither was Jimena. Her nipples were exposed, and those pink tips were hard with excitement. Teresa associated her periods with sex, and she was as aroused during her periods as she was during the times when she was ovulating. For the moment her shirt was up, Jimena peeled off one of the stickers from a sheet in front of her. A sparkly, red-colored star was put over her nipple, covering enough that the edges of the areola were still visible.

A quick laugh filled the clubhouse, and Teresa retaliated by putting a golden heart-shaped sticker onto Jimena's nipple, quickly lifting her shirt to stick it on. Jimena turned around, bending over on the small table within the clubhouse. She had been standing with her ass facing the window, shaking it back and forth while she was talking. Steve had a clear view of her butt. After observing them for a few minutes, his cock was so hard it felt like it was going to burst through his pants. That brown butt, wider and rounder than his daughter's, was begging to be fucked. Underneath the shade of the nearby tree, Steve unbuckled his belt and lowered his pants. His underwear followed, with his cock springing free.

He stood up, keeping the upper half of his body out of sight, and slid his cock in through the window of the clubhouse. The sunlight coming in through the windows was the only source of light in the clubhouse. He thrust his dick through the window, resting his balls on the windowsill. Jimena slapped a sticker on her butt just above the waistline of her panties, where a "tramp stamp" would be if it was an actual tattoo. She noticed Steve's dick coming in through the window. Teresa's heart skipped a beat. She had been keeping this part of her life a secret from her friends. She knew that if he saw her and her friends in their underwear, he would want to do naughty things with them. His project in the garage had taken shorter than she thought.

"Dad!" Teresa said.

"That's your dad's dick?" asked Jimena. "Why didn't you tell me he was that big?"

"I can't tell you that my first boyfriend is my dad. That's so uncool," said Teresa.

"Your dad's good looking," said Jimena.

"Teresa, I can't control myself. Can you come out here?" asked Steve.

The two girls left the clubhouse. The stickers on their bodies shimmered in the sunlight. The strings of their tampons were hanging out the sides of their panties, and beads of sweat dripped down their bodies. The smell of young girls at play reached Steve's dick, making it twitch on its own and leak precum out of his exposed tip. Even if it was in front of her friends, Teresa was overcome with the urge to suck it. Her dad alway got hard when she was on her period, and it was her duty as his daughter to suck out his desires, otherwise he'd want to fuck her more than once a month, and that was dangerous for a father and daughter to do.

"Geez, dad, you're stiff," Teresa said. She wrapped her little hands around his cock, caressing it and lubing it up with the drop of precum that had already come out. His twelve year old daughter's hands running across his cock made his body grow hot. His cock lengthed in her grip, gaining an inch compared to when she first touched it. Teresa didn't stop talking to Jimena while she stroked him. Instead, she wanted Jimena to join in playing with them. Jimena wouldn't be picked up for another few hours. She had more than enough time to learn about sex. "Jimena, this is all your fault."

"What'd I do?" JImena asked.

"It's your big butt!" Teresa said.

Teresa opened her lips, and took her dad's cockhead into her mouth. She sucked and slurped at the tip, covering the length of his dick in her saliva. Jimena watched. The red spot on the front of her panties grew. A mixture of her pussy juice and some period blood that had sneaked past her tampon came out. She was at the age when she was getting curious about sex. The last time she had visited an older cousin of hers, she tried to look at his dick, wondering if she could tempt him into getting an erection. He had put his dick away before she could see more.

Jimena grabbed the edges of her panties and pulled down. She exposed half of her ass. It was the same shade of light brown as the rest of her. As she bent over in front of Steve, her ass cheeks spread apart to reveal her little hole. That wrinkled, winking hole that was drawing Steve's attention. Jimena lowered her panties further, and the only thing hidden beneath the fabric was her pussy. Jimena smacked her ass, making her plush cheeks jiggle. Beads of sweat rolled down them as the vibrations shook them up. One of them flew off her ass and landed on a blade of grass.

"I was going to try masturbating with Teresa, but it looks like she has more fun ways of making herself feel better," said Jimena. "Wanna play with my butt?"

Steve got on his knees, bringing his head closer to the height of Jimena's ass. Teresa lowered herself, continuing to suck on his dick. Her little tongue flicked around his shaft, returning to his glans before traveling down the length of his member once again. Teresa had become quite the skilled little cocksucker, knowing how to please her dad whenever he asked. Jimena's panties dropped to her ankles, exposing her tampon string and the rest of her butt. Steve stuck his nose between her ass cheeks, and the softness of her wide hips pressed against his face.

His broad hands wrapped around her light brown butt cheeks, squeezing her ass flesh and taking a closer look at her asshole within. With his nose pressed up against her hole, he took a deep whiff of her smell. The ripe, sweaty ass stink of an eleven year old girl made his cock throb inside Teresa's cheek. He was about to cum inside her mouth. Fighting against his instincts to enjoy this a little longer, Steve extended his tongue and swirled it around Jimena's anus. Her backdoor was covered in warm saliva, which swirled towards the opening and went inside, lubing her up below. Jimena squealed with pleasure.

"Your perverted dad is licking my butt," Jimena said. "Does my big butt make you horny, old man?"

"My daughter has the sexiest friends," said Steve, continuing to swirl his tongue around Jimena's hole. "You're on your period, too."

A sly smirk crossed Jimena's face. "Your daughter's bloody pussy isn't enough to satisfy you? Now you're lusting after mine. If you weren't good looking, I wouldn't be considering it." Steve's tongue teased her ass in a spot she didn't know she had. Jimena's eyes and mouth opened in an expression of unknown pleasure. She gave out an erotic moan. Steve took one last whiff of the inside of her ass crack, savoring her smell. Teresa let his cock out of her mouth, and planted a sweet kiss on his tip. She had stopped just before he was about to cum.

"I get him first," said Teresa, still gripping his cock in her fingers.

"You get him every day. Stop hoarding such a good daddy cock," said Jimena. "I'll fight you for it."

"Girls, you don't have to get physical over me," Steve said. "I know a way we can settle this."

He asked Teresa to remove her panties too. The two girls were naked except for their socks and the stickers they had put on earlier. The tampon strings hanging out of their pussies were gently blown about by the breeze. Steve saw a spool of thread on the table. He gave a brief glance to the opened calendar, wondering where his daughter had found such a thing. Before he married, he had put up calendars with naked women, so he understood the desire. He couldn't help but feel a slight pang of jealousy, wondering why she was admiring their cocks when she had her favorite one available to her at all times. He unspooled some of the thread and cut it off, eyeballing the length. The girls were waiting outside the clubhouse, wondering what he wanted them to do.

Steve extended the string until it was taut. He reached between Teresa's legs, holding onto the end of her tampon. Teresa was shocked that he was touching it in front of her friend. Steve bent down and tied the end of the string onto her tampon. He asked for Jimena to spread her legs. She did the same. The string was tied onto her tampon at the other end. After checking that the knots were firmly knotted, Steve looked at the girls. The shadow of his cock cast down on their faces, nearing their mouths. He was still rock hard, with the smell of Jimena's butt still filling his nose when he sniffed. He looked down at the girls with the stern demeanor of a father, and told them what he was expecting.

"I want to help both of you with your periods, but if you're going to fight over me, let's make it fair," he said. "With a game of tug-o-war."

"With our tampons?" Teresa asked.

"The first one to pull the other's tampon out will get to play with me, while the other one has to wait her turn," said Steve. "Get crab-legged and go for it."

Jimena and Teresa put their hands behind them and got on all fours on the ground. They spread their legs, and each of them could clearly see the other's pussy. Even from this angle, the size of Jimena's butt was clear. They clenched their pussies tightly around their tampons, and started moving their hips in the opposite direction. The rope started to pull down the tampons from within. It slid down their vaginal canals, the bright red end of the formerly white tampon starting to emerge from within. Jimena was less athletic than Teresa, but she was still full of youthful energy. Jimena felt the force of Teresa tugging at her, hoping to make her tampon pop out.

"You're doing great, girls!" Steve said.

"I'm not letting you take over me and dad's private time," Teresa said.

"If I win, you can play with my butt more," Jimena said. "Are you staring at my coño?"

Teresa glared at her friend, and pulled harder. Her fingers were digging into the dirt as the blades of grass rolled between them. The two of them were sweating. Beads of sweat rolled down from their armpits, making its way to their fingers as they tried to pull out the tampons. For them, it felt like a life or death struggle. The pain in their pussies and the force of each other's pulling were competing inside their lower bodies, the feeling only slightly assuaged by the sense of arousal they felt at seeing Steve's hard cock right in front of them. Their groans became more sensual as they continued to pull, watching more and more of the tampons slip out of each other's pussy.

"I'm gonna win!" Teresa said.

"No you won't!" Jimena countered.

Jimena yanked her legs backward. Teresa's tampon came out of her pussy, landing on the grass and painting the green blade red. Teresa could no longer stick it back inside her now that it had gotten dirtied. Love juice and period blood leaked from her pussy, staining the inside of her thighs. Jimena stood up, letting the string with Teresa's tampon attached dangle between her legs. She grabbed at the string and removed her own tampon. Though her fingertips were bloodied, Jimena spread her pussy with her fingers, showing Steve the red and pink insides of her young snatch. She gave him a confident look, knowing that she had earned her reward.

"I win," she said. "I think that'll fit."

"We'll make it fit,' said Steve.

JImena bent over against a chair in the backyard. Her wide bottom was thrust out towards Steve. He got on his knees, bringing his cock close enough to her butt. His dick was covered in Teresa's saliva, and felt hotter than the sun hitting against her sweaty skin. Steve smacked jimena a few times on both of her butt cheeks with his hard cock. She was being a little too cheeky, and he wanted to make sure she learned her lesson. Steve placed the tip of his cock against her pussy entrance. He was going in raw. The head fit inside her after some resistance. The slipperiness of her love juice and period blood coated his dick, turning it into a bright red rod that was plunging deeper inside Jimena.

"Your dad's cock is great in my pussy," said Jimena. "It's really big."

"I know, now when I can ride it?" Teresa asked.

Steve slipped further inside Jimena. His cock had been sucked in, nearly down to the base. He put his finger on Jimena's nipple, teasing her little nub and making her cry out with a cute voice. His cock was as deep inside her as it could go. The narrowness of her pussy squeezed around him, transmitting a pleasurable sensation all the way to his balls. When he pinched her nipple, her pussy tightened even further around him. Keeping one hand on her butt, Steve pulled his dick out, and started to thrust inside her. Doing it in the backyard was risky, but their backyard had a fence around it, and their neighbors on either side were all not at home at the moment. He could go wild with her as he pleased.

Her dad's dick had been coated in her friend's period blood. Jimena's moans turned into sensual sighs. The pain of her period was fading away with each thrust, replaced by the joys of sex. Her pussy was wide open, and the frothing pink love juice and blood mixture that leaked out splashed onto the patio. Steve would have to hose it down later. Jimena turned around, showing him the expression of bottomless lust on her face. Her curiosity about sex had been answered, and she wanted to know more.

Steve slapped her butt with his hand. Her fat cheeks jiggled around his cock. The sight of her ass, far too big for a girl her age to have, was making him throb inside her. He realized that he was no longer the only one doing the thrusting. Jimena had started to move her hips on her own. She raised them into the air, and slammed them down on his dick, letting it slide through her pussy and grind against her insides. Steve kept his grip firm on her ass, and spread it open to reveal her tight butthole. The hole was still lubed up with his saliva. He put his finger inside her asshole, sliding into her bowels. It hurt at first. Having something so big going in such a narrow hole was more than Jimena had been expecting. Her ass became used to being spread open by his finger, letting it circle around inside her.

"You can't get enough of my butt. If you were my daddy, I'd walk around bottomless for you so you could see it," said JImena.

"My pussy's a better fit for him," said Teresa.

"Jimena, do you just want someone to pay attention to you?" asked Steve.

"They should pay attention to me. I'm an adult now!" she was using the same logic as Teresa. Steve couldn't deny what she was saying. He wanted to teach her what an adult was supposed to feel like. Despite her talk, Jimena had the tone of a girl who had only accidentally managed to make herself orgasm. Steve pulled his finger out of her butthole with a wet pop, and slapped her across the ass from the other side. Her jiggling butt cheeks drove him to orgasm. She was on her period, so it's okay if he was going in without a condom.

His dick exploded inside her. A hot surge of spooge filled Jimena's tight eleven year old pussy. She opened her mouth in shock, drooling a little as the wave of orgasmic pleasure washed over her body. She came down from orgasm, squirting onto the ground. Looking down between her legs, Jimena turned back towards Steve with a shocked expression. "I peed in front of him! I'm sorry, I didn't..."

"That's not pee," Teresa said. "It's squirt."

"What's the difference?" asked Jimena.

"Squirt happens when you pet your pussy and it feels good," Teresa said. "It means..." she sighed. "My dad made you cum."

Steve pulled his cock out of Jimena's slit. Her asshole hadn't fully closed after he fingered her, and her pussy was dripping with the load of semen that had been deposited inside. The pain in Teresa's stomach had been replaced by a pleasant, sticky warmth. Steve's cock, soaked in red and white, looked like a barbershop pole. Tersa went inside to get a towel, wanting to wipe down his cock before it went inside her. JImena told her to get a drink while she was inside. She had sweat and squirt so much from her orgasm that her body was feeling hot and tingly all over. She took a seat in the chair with her legs spread, showing off the results of Steve's orgasm to him as it dripped down her thighs.

Her dad's face beamed down on her. Teresa had been patiently waiting, leaking her period blood without a tampon until it was time. Now she was up against the wall of the clubhouse, raising one leg into the air while her dad's cock thrust inside her. Despite the vigorous fucking he had given Jimena, he was still hard and ready to take her on. His dick slipped inside her with ease, grinding against her vaginal folds and soothing the pain of her period. He rubbed Teresa's stomach to help her along. Steve could faintly feel the shape of his dick through her stomach. When it emerged from her slit, it had been covered in a fresh layer of period blood and pussy juice.

"As the leader of the Red Panties Club, you have permission to cum inside me, dad," Teresa said.

"You don't need to be the leader of anything. You're my beloved daughter, and I want to make you feel good," said Steve. The wet and squelching thrusts of his cock inside her sounded louder than they actually were. Doing it outdoors was a rare treat for them. They often wanted to keep it secretive. When the weather was this warm and Teresa was already naked, it felt wrong to not do it in the backyard. Steve peeled away the sticker on her nipple, exposing the hard tip. He leaned over and kissed her nipple, gently sucking on the hard tip while thrusting inside her.

"You're such a daddy's girl," said Jimena, watching from the sides. "This does make me feel tingly. How long have you been doing it with him?"

"Since my first period," Teresa said.

"It was the quickest way to make her feel better," said Steve.

"And it still works," Teresa said. She gave him a kiss on the cheek. His dick was deep inside her pussy, almost knocking at her womb. It was the source of the blood flowing from between her legs, painting the two of them red. A red that was stronger than the blush on Teresa's face. She loved these moments when it felt like she was one with her dad. Jimena wanted to tease Teresa, to see if she could push her over the edge in front of her. JImena squatted down, making sure to give Steve a perfect view of the curves of her soft butt.

She poked Teresa's clit with her finger. Teresa strongly tightened around her dad's dick. His hand was rubbing against her chest, and he spurted his second hot load inside her. Teresa cried out with a voice that Jimena had never heard from her before. One that spoke of a deeper understanding of sexual pleasure. She would have a lot of catching up to do if she wanted to be as lewd as Teresa. Steve's cock fell out of Teresa's bloody pussy on its own, dripping the last drops of blood and semen onto the ground. Teresa's squirt arced into the air. Hot drops of bubbling squirt dripped across Jimena's butt like raindrops.

Steve grabbed the towel that was hanging from the windowsill, and wiped his cock off. He zipped his pants back up, and told the girls to go inside and clean up. It wouldn't be much longer until Jimena's parents came to pick her up. To save time, the two of them shared the same shower. Red blood and white cum swirled out of their pussies into the shower drain as they soaped up. When they stepped out, they were sparkling clean. Steve came over to the bathroom to set their folded up clothes outside. He opened the door to check.

The bathroom mirror was fogged over with condensation. Jimena turned around when she saw him coming. She lifted the towel up her back, fully exposing her butt to him. Teresa carefully eyed his pants, watching to see if another bulge of an erection appeared. Steve believed he was spent after cumming in both of them, but his cock began to stir back to life. Jimena rubbed her butt against his legs, tempting him for one more round in front of his daughter. She had spent the whole time in the shower enthusing about how she had fallen in love with his cock, and how good it felt inside her. With her period pains momentarily gone, Jimena gave him the best set of bedroom eyes she could manage.

"I'll be over to play again," she said, putting her hand on her hips.

Steve bent down and whispered to Teresa. "Are any more of your friends getting their periods?"