"Mmm~ Slurp~ Daddy's cock... it's so big, I can't fit it all in..."
Little Mystia tried her best, but she could only take about a third of the shaft into her mouth. She wanted to swallow it all like her mother did, but she was just too small.
"It's okay. You're still young. When you grow up, you'll be just like your mom."
Kars patted her head, making her beam. She redoubled her efforts, swirling her tongue around the glans, desperate to taste his cum.
"Daddy, are you gonna cum yet? I want to drink it."
"It might take a while like this. Want your mom to help?"
"No! Then you'll just fuck her and ignore me!"
She hugged his meat, rubbing her cheek against it. "You promised me tonight! If my mouth isn't enough, use my pussy!"
She dragged him to the bed, lay down, and spread her legs, exposing her pale, virginal pink slit.
"Hehe~ see, Daddy? My hole is begging for you. Hurry up and put it in."
She stirred her finger in her hole, making wet, lewd sounds and pulling out strands of slime. Kars climbed onto the bed and laid his rod across her belly. It was so long it reached all the way to her stomach.
"So big... I don't know if I can fit it all."
She stroked the meat on her stomach. She wasn't nervous; she had watched her parents fuck countless times. She was only excited that it was finally her turn.
"It's a very cute hole. Truly my daughter. I'm coming in."
Kars lined up his glans with the entrance. It was a tight fit.
"So tight. It feels like your pussy is trying to push me back out. How are you feeling?"
"Mmm~ okay... but the head is already stretching me so much... I can't imagine what the whole thing will feel like."
"Let's find out. I'm going to do it in one go so we don't waste time. Ready?"
"Yes! Just use my body like a toy, Daddy. As long as you're happy."
"What a good girl."
Kars kissed her to distract her, then slammed his massive rod into the petite hole. Her entrance was stretched into a perfect circle, and the head hammered against her developing womb. You could clearly see the shape of the cock bulging against her lower abdomen. Little Mystia's eyes rolled back, tears streamed down her face, and her legs twitched as a puddle of urine and juices soaked the sheets.
She had peaked and lost control of her bladder instantly. The sheer sensation of being filled had broken her.
"Ahhh! My pussy... it's breaking... Daddy's meat is too big... it feels so good..."
"It's great, right? It's about to get even better!"
Kars began to thrust. The friction against her young walls was too much; she peaked again immediately.
"Eeeek! Again... I'm going again... Daddy... I love your cock... Mommy, look! I'm finally fucking Daddy! My hole is shaped like him now...!"
"You're doing great, honey," Mystia said, watching them with a lewd, doting expression. She was glad her daughter could finally share in the joy of serving Kars.
Mystia crawled onto the bed and joined them, kissing her daughter deeply while Kars hammered away. The sight of the mother and daughter tongue-kissing was the final straw for Kars.
"I'm cumming!"
A massive torrent of semen flooded Little Mystia's vagina and womb. Her belly visibly swelled into a "watermelon" shape as he filled her to capacity.
"Ohhh~ so much... so much cum... I'm full... it feels like I have a baby in here... Daddy... did I make you feel good?"
"The best. Look at how much I shot inside you. You're a wonderful daughter."
"Hehe~ I'm so happy I could make you cum... I'm so lucky to be your daughter..."
"Then let me make you even happier."
Kars wasn't satisfied with just one round. He started a second.
"Kagerou, you too."
Kars looked at Kagerou, who had been masturbating off to the side, not wanting to interrupt the family moment. "You're part of the family now, too."
"O-okay!"
Kagerou joined them, and the four of them spent the rest of the night tangled in a mass of limbs and lust.