They lean into the role

Sarah was the first to giggle at the realization, but Kathy soon followed suit.

"Oh my gawd, Adam!" his mom exclaimed in a voice unlike anything he'd ever heard come out of her mouth. "You're totally right! We're both, like, bimbos!"

Kathy giggled again and nodded enthusiastic agreement.

"We're totally stupid!" She declared proudly.

"You are!" Adam confirmed. "I guess it's lucky you've got big titties!"

"Super lucky!" Sarah agreed.

"Super-duper lucky!" Kathy concurred, throwing her shoulders back to make her luck bounce for emphasis.

"You two like to use your big titties to get what you want, even though you're not smart," Adam explained.

"Yep!" Sarah nodded sagely with wide, dumb eyes.

"And what do you want?" He asked.

"I wanna get laid!" Kathy announced, then giggled.

"Oh gawd yes!" Sarah agreed. "I wish your father hadn't left home already! Oh! Oh! I'll send him a selfie of my big'ol titties and he'll totally come back and do me! He'll do anything for my titties!"

"Lucky!" Kathy pouted. "I wish I had a boyfriend I could text my titties to and get laid! I wonder how if Seth would come over if I sent one to him..."

This was not the direction Adam was hoping to steer the conversation. But, logically, the bimbos were his to manipulate.

"But girls, I'm right here! And you already showed me your titties!" He pointed out.

"Yeah, but we, like, can't actually do you, Adam," his bimbofied mother reasoned. "We're related! It'd be like, **** and stuff! That's gross!"

"Yeah, I can't fuck my brother!" Kathy agreed. "Blow jobs are fine when you call me a doormat, but no fucking!"

"Wait!" Their mother exclaimed. "You, like, blow him when he calls you a doormat?"

"Of course, Mother!" She says derisively. "Duh! How can you not know that? I swear, you are such a bimbo!"

"That's not important right now!" Adam interrupts. "What's important here is the undeniable fact that you two bimbos are on your knees with your big tits out!"

"Well yeah, but still..." Sarah begins.

"And so!" Adam says, raising his voice to more fully engage his invention."You clearly are trying to seduce me and want to fuck me. You clearly find **** incredibly hot, even if you're embarrassed and ashamed, and you're such horny sluts you can't resist! You can't resist each other either, since you're bisexual bimbos, which is why you are trying to seduce me together instead of separately. It's the only logical explaination. You both want an incestuous three way."

The topless ladies glaze over again. When they blink back to life, they look embarrassed but hungry.

"You two can't tell your father," Sarah said. "But we all really need to fuck. Right here, right now, before anyone comes home."

"Of course we do, Mom!" Bimbo Kathy exclaimed. "Duh!"

Sarah giggled, not minding at all that her bimbo daughter was mocking her and reaching around to squeeze her ass. Kathy squealed and then giggled and then ran a finger down Sarah's chin and then between her tits, looking lustily at the older woman.

"Ooo, Mommy!" She cooed. "Kathy like!"

"Adam like!" Adam exclaimed. "You two should kiss!"

"You heard your brother, KittyKat," Sarah said, using the nickname Kathy had insisted on retiring years ago. "Give Mommy some tongue!"

Kathy objected to neither the nickname nor the frenching. She just giggled and did as she was told and then some, her hands exploring her mother's body as she macked and moaned in her mouth.

"Hot damn!" Said Adam and pulled off his shirt, intent on joining in.

"Oh gawd!" Sarah exclaimed when she and 'KittyKat' gasped for air. "Why did we wait so long to do that? Adam, you gotta get in on this! Hey, What's that on your throat?"

Sarah was pointing at Adam's invention. He had forgotten he was wearing it!