Carter drove his car during his vacation trip, which was to spend a week at the beach. Along with him were some college friends who were also on vacation and would stay with him. Trevor was sitting in the passenger seat next to him, and in the back seat were Heater on the left and Diana on the right.
They chatted excitedly making plans as they cut through the city and didn't even realize the danger until the car was hit hard by Kim's, who went straight through the windows on Carter's side, flooding the interior of the vehicle and leaving everyone inside completely. white with the material. With the scare Carter lost control of the car and he tried to brake, having to find the brake pedal submerged in the white material, but the asphalt was slippery due to the cum and the car slid, spinning on the track until it climbed on the sidewalk, breaking a fence and stop in a lawn. Carte and Trevor managed to hold themselves firmly in place, but Heather and Diana had been thrown at each other and were together in the middle of the backseat now.
Amidst their confusion and without realizing the situation they were in, Trevor was more concerned about the girls in the back seat asking if they were okay, not even realizing that he himself had already started to transform and two pairs of breasts were growing on his back.
"I'm not hurt, but I'm feeling a little weird. What is white thing?" said Heather, who lifted her hands from the gooey substance that covered everything below her nipples. "No way, this is all cum."
"It seems so, but where did all this cum come from?" Diana said
"It came from there, look." Carter said pointing to the giant mutant sticks that could be seen in the distance. When he did that he noticed that his hands were covered in scales and he had claws. "Not this one, that one is a mutant and it's contagious. We've already been caught and we're changing."
"You must be kidding." Trevor said, finally noticing the H-cup breasts on his back. To his astonishment it was noticed he also noticed that his voice was different, sounding more feminine.
"And with that our vacation is ruined." Diana complained
Something emerged from the cum, which they soon recognized was a pretty big dick.
"Whose will this dick be? I can feel my body changing, but I don't know what's going on underneath all this cum. From what I feel this dick could be mine, let me confirm." Heather said, grabbed the emerging cock and felt it confirming that the male member belonged to her.
"Aahh, this dick is mine, I can feel you touching it." Diana said
"Wait a minute, I can feel the touch too." Heather said
"So the dick belongs to you two. You must have merged." Carter said, now having a female voice as well, the visible part of his body entirely covered in scales and his face elongating enormously forward. "I think we better get out of the car, we don't know how this will continue but it could get worse. I can already feel a strong pressure behind me, I think I'm growing a tail."
The group opened the car doors, Trevor having a harder time as he couldn't get into a normal position, causing much of the dammed cum inside to spill out and onto the lawn.
Carter got out of the car easily, quickly taking off his now too-tight pants, discovering that he had become fully female as his ass, cock and balls had given way to a cloaca. Her body was fully covered in scales now that a pair of breasts the size of her head had grown out of her chest, just as her reptilian tail had finished growing, completing her transformation into an anthro crocodile woman. She thirsted for the lust that came with the mutation, fucking her cloaca with her own tail until she came.
Trevor had a harder time getting out because his body's orientation had shifted, the bottom half having inverted and turned backwards. Like Carter he became fully female. Two more pairs of breasts grew in front of her, her face got weird as her eyes and mouth switched places, her hands became feet and her feet became hands. She also discovered that her anus was behind her, where her cock used to be, and her pussy was between her ass buttocks, which was in front of her now.
Heather and Diana's biggest difficulty was coordinating movements, as they now shared a single bottom half. They got out of the car to find they shared a single pair of eagle legs, a single two-and-a-half-foot cock and ballsack with testicles the size of melons. Their transformation continued with an eagle's tail growing over their shared ass and their arms transforming into big, strong wings. Heather's C-cup breasts have grown to E-cup, matching Diana's original size.
Using her wings, Heather stroked their shared cock until they came, and after the conjoined shemale harpy's first orgasm, they felt something stretch her ass and come out, falling onto the cum-filled lawn.
"Did we lay an egg?" Heather asked
"It makes sense, because technically we're half-bird now." Diana said
"Even though we're totally male down there now, we'd need to have a vagina or a cloaca, which we don't." Heather said
"Maybe, but remember that mutations don't follow logic, we can only accept it." Diana said "Now, you've played with our dick, now it's my turn." she said and started jerking off using her wings.
When Heather and Diana came again, they laid another egg up their asshole right after their orgasm ended, making them realize that they would lay an egg for every orgasm they had.