May and Kayla, servicing mom

After the holiday and returning home, life turned to normal for a few weeks, until you found out May too was pregnant. And just coming back from the appointment with the doctor, it seemed likely you were going to have twins.

"Hmm," May sighed, rubbing you already growing belly. "We'll have a big family, won't we?"

"With all the money I won, I wouldn't be surprised," you chuckle, running your hand through you sister-wife's hair. "We'll be sure to have them grow big and strong, right may?"

"Yes..."

Hugging a little longer, you hear the door open, and in came your mother.

"Hey girls!" she beamed. "How was the checkup, Kayla?"

"Good, thank you," to smile.

"Right," your mom removed her coat, then skirt, revealing her huge dick, stroking it to hardness. "Eat up, I made sure to have avocados the last couple days."

You open your mouth wide and accept the cock inside it. You grab the shaft and pump it hard, groaning, licking, and suckling the tip, tonguing the hole.

"Eager today, aren't you?" mom chuckles.

For several minutes, you jerk the cock, then feeling it throb, you clamp your mouth around the head. Sweat, tasty cum gushed into you mouth and flowed down your throat. When you were confident she was finished pumping out her load, you withdrew and turned your eyes to May, who put the monocle on, staring at mom, licking her lips.

"Now that's been done, we'll move on to the main course," mom said.

You lay back on the sofa, pull off your skirt and knickers, then lifted your balls, presenting your pussy, while May pulls your top off and milks you by mouth.

"Let's give my granddaughter some good luck!" mom said as she pressed her cock inside you.

Mom was large, bigger than May or yourself, so there was a little discomfort as she ploughed your box. She was skilled with how she used it, clearly having had plenty of partners before falling in love with dad; it was a pleasure of a master at work, hitting all the right places with only the slightest adjustment between thrusts. It was a less than common tradition, yet still an accepted one, where the mother of a pregnant futa, if they themselves were a futa, would fuck her daughter once a week and cum in her pussy. It was supposed to make giving birth easier, safer, and transfer some "luck" to the unborn child or children, that they would be grow up beautiful and well endowed. You weren't sure if there was any validity to it, however, mom was a little worried about you, so you allowed the tradition to happen.

After a few minutes, you cum, then mom, keeping her cock inside you, to make sure the cum soaks into your womb.

"Right, your turn May," mom turned her huge cock to your wife-to-be.

May blushed, first taking it into her mouth, then into her own pussy, and when mom exploded her load and waited for a small amount of time, she pulled out.

"Alright, now I have to prepare something for your dad," mom smiled and made her way to the kitchen.

"What a funny tradition, don't you think, May?" you sigh and turn to your soon-to-be-wife.

"Yeah..." May pants.

"I wonder where it started...?" you ask as you pull up your phone, and tap it into google.

After some seconds, it showed that it was a tradition of the Celtic, Germanic, and Slavic tribes thousands of years ago. There weren't many that still practised it, with the roman conquests, but held in the Slavic nations, Wales, Scotland and northern England, and Ireland.

"Grandma was from York, wasn't she?" you ask.

"Yeah..." May gave a half-hearted nod.

"And her wife was from Poznan?"

"Poland?"

"Yeah."

"She was."

You look at your phone and laugh. "That explains why mom does it... are you looking forward when our daughters become expecting mothers? You know, continue the tradition?"

May blink, blushed and turned her head to the side.

You laugh, pause, and snuggle up to her. "I love you."

"I love you too."

"Our daughters are going to grow up to two great moms, won't they?"

"I'll be the favourite."

"No, I will!"

Laughing and tickling each other, you wrestle for a while, until you are kissing and making out on the sofa. You feel May become hard, and press your breasts into her face. "Come on, I think you need to calm down."

May clamps onto your nipple as she humps you, thrusting her cock deep inside your needy pussy.

"Hey, I'm home!" dad called out as he came through the door, then stopped and stared at you and May going wild.

You freeze in place, turning to your dad, and smile weakly. "Hey, dad. May is helping me out," you look down to your sister, who again had a monocle on, looking away from you. Following her gaze, you land back on dad, her breasts heaving and huge, black hair cascading down her body, her legs shapely, her figure as beautiful as her face, and the head of her huge cock peeked out of her generous cleavage. "You did good at work today?"