Holly makes herself the big sis

As Holly's mind filled with the possibilities of the book, David woke up. He turned to smile at Rose and Emma beside him, then looked up at Holly. "Good morning! Since the two of them are busy, maybe you could come over here and-"

"Oh, I'm not busy!" said Rose. She hastily pushed Emma away and climbed on top of the big man. She mounted David's large cock reverse cowgirl style and slid down it slowly. When she bottomed out, she gave Holly a thumbs-up sign. That looked innocent enough to David, but the twins had a long tradition of using that sign to gloat about being the twin who got the first fuck of the day.

Holly gritted her teeth. She was getting tired of Rose's constant competitiveness. Rose had always acted like being born first mattered, even though there was only two minutes difference. Sometimes it even seemed like their parents favored Rose. Then she realized that she could actually change all that. She opened up the notebook, started a new page with "The Lien Twins" at the top, and wrote a rule.

• Old Rule: Since Holly was born two minutes earlier, Rose has always deferred to her in everything. Even their parents have always treated Holly like she was in charge, making it clear that she was their favorite, and giving her everything she wants. Most people automatically treat Holly as the leader.

The engineer in Holly knew she should stop at one change and test out the results. However, she wanted to know if this rulebook could only affect behavior, and she was too excited to stop.

• Old Rule: Holly is not just the "big sister" in age. While Rose is 5'6", Holly is 5'11". While Rose is a D-cup, Holly is an F-cup. While Rose has some curve to her ass, Holly has a full bubble butt. People think they must only be semi-identical, since Holly is clearly a little better in every way.

Then she smiled mischievously and erased the words "a litter" so it just said "better". When she finished, Holly watched in fascination as the words were absorbed into the paper again. Her vision went a little wonky for a moment as the words reappeared. When she looked up, Rose was back to lying in the bed next to David, getting eaten out by Emma like before.

"Yeah, that's a great idea," said Rose with a deferential tone that Holly had never heard in 21 years of being a twin. "You should have the first go, Holly!"

Holly looked down at herself. She could see a difference, even feel a difference, but she wanted a better comparison. "Rose, come here a sec."

Without hesitation, Rose slid out from under Emma's eager tongue and walked up to her sister. She didn't even say anything, she just looked up at her "identical" twin and smiled.

Rose only came up to Holly's nose. After a lifetime of feeling like she was looking in a mirror, Holly could now see the top of Rose's head. She looked down and saw that her breasts and ass were clearly much bigger than Rose's, although their waistlines were still equal, giving Holly a more pronounced hourglass shape. This gave Holly the perfect before-and-after comparison, and she couldn't believe how big an improvement the rule had made. She wasn't inanely humble, she'd known before that she was extremely hot, but this was still a big improvement. She was a bigger, better version of herself, and clearly better than her sister, too.

She turned towards the bed. "Hey David, who's hotter, me or my sister?"

David propped himself up on an elbow, ran a hand through his sandy hair, and flashed a charming smile. "Come on, don't make me say it! I don't want to be rude!"

Holly licked her lips. "You're too nice!" She shoved the rulebook in a desk drawer, then went to the bed. She climbed onto David, straddling his hips. She twisted around and looked behind her. "Rose? I think David's big balls are going to need some attention."

Happy to be included, Rose quickly got in the bed, positioned herself on all fours behind her sister and started licking David's ballsack. This put her at the end of the bed, with her ass hanging off, so Holly said, "Emma, you can stand behind Rose and lick her ass, okay?"

Emma held up her hands like paws and smiled. "Yip!" she said in happy agreement as she ran behind the shorter twin and got to work on a sloppy rimjob.

Holly briefly wondered if Emma was only allowed to make dog noises, but then lost all conscious thought as David reached up and grabbed her F-cup breasts. Even his big hands couldn't cover them, so he focused on lightly rubbing her round nipples with his thumbs.

"God, you're so fucking hot!" said David. "I love the little, short girls too, but it's so nice to be with a girl who doesn't look like a midget next to me."

Holly bit her bottom lip as she gently stroked his large shaft and enjoyed the tit massage. She could hear the two sets of slurping sounds from behind her. This all pushed her need way up, so she carefully rose up and positioned David's terrific cock at her entrance. She moved down slowly, letting him fill her up an inch at a time. Her pussy was so wet that she was able to slide down on it, but it was definitely the tightest fit she'd ever had. She put a hand behind her head and another in the air as if she was riding a bull, which she kinda was.

"Fuck, this is hot!" said David. He let go of Holly's huge tits and watched them bounce. "Your body is so fucking incredible, Holly! And Rose-fuck!-your tongue has some real talent!"

Rose made an appreciative sound, but it came out muffled because she didn't want to take her tongue off his balls. Also, Emma's tongue on her ass was also distracting her in a wonderful way.

Holly rode David faster and faster. "I'm going to make you cum so hard"

"Oh, yeah, you definitely are!"

Holly rode him for a long time, so long she wondered if her stamina had improved, too. When both of them were extremely worked up she looked down at him and said, "Say it!"

David's could barely focus on anything and didn't understand. "Say what?"

"Tell me which one of us is hotter." Holly didn't want to hurt her sister, but this was her moment. She just needed one moment of being the clear winner, without the endless competition that had always been part of their relationship. "I need to hear you say it."

David rolled his head back, overcome by the double sensations of two hot women working his cock and balls. He said, "Fucking hell, Rose is hot! She's so fucking hot, I'd be all about her if..."

Holly shook out her long, straight black hair and cupped her hands under her huge breasts. She was moving up and down very fast as she got close to climax, but she felt like she was moving in sexy slow motion. "If what?"

David spasmed a little. "I'd be all about her if you weren't ten times hotter! Oh fuck, how are you so curvy and tall! Your pussy is even tighter than hers! I've never felt squeezed like this! I'm going to... to... I'm cumming!"

Holly stayed where she was, she wanted to feel him fill her up as she came. It felt incredible, even better than the sex they'd had the night before. Her orgasm seemed to last forever. She put her hands on his chest and leaned on him with her full weight so she could move her hips faster and pump as much out of him as possible. It felt amazing.

When she was done, Holly fell forward on to David's muscular chest. He pulled her off him and moved her into a comfortable position with her legs off to the side but her top half still lying on his chest, her arms wrapped around him like a body pillow. They cuddled like that as Rose stayed on all fours between his legs, still working his balls and getting her ass eaten out by Emma.

Holly was in a delighted haze. They all stayed that way for awhile. Rose was clearly enjoying the attention of the club mascot, but it wasn't getting her off. Holly considered offering Rose the next turn with David, but...

"Hey Rose? I think I'm going to call dibs on the next round with this terrific cock. Probably the next few rounds after that, too. That's okay, right?"

Rose's eyes snapped open. She looked disappointed, but then gazed lovingly at her older sister. "Sure, whatever you say!"