Fast forward to them at home

When Alex and her brother got home, still naked, they greeted their mother Sally like nothing was wrong. Sally responded, but was shocked at seeing her kids hanging out naked around the house so casually. Feeling like a prude, she headed upstairs to undress.

Alex hit the couch and flipped around at various channels. As one should expect, no channel was without some sort of nudity or sexual content. Of course, there were purely sexual ones as well, such as those featuring specific fetishes and ages. She then found a channel apparently devoted to helping like her family adjust to the new world. There were two hosts, one male and one female, who would be in different scenes depending on the context. Apparently today was targeted towards adjusting to high school, which was fairly convenient.

"Whatcha watching, sis?" Pat plopped down beside her, his erect cock sticking in the air. She looked at it, and then back at the TV, where the woman was showing what to expect in a high school bathroom. Like all bathrooms here, it was unisex and had no doors or dividers for privacy. You could see students having sex in the background as the woman talked.

"This channel is all about helping people like us transition." She looked around to check for her mother, and then began stroking his cock. It felt very unnatural, but she was determined to play it off like it was nothing, just like a citizen of their new world would. She looked back at Pat. "How are we going to explain Dr. Chen's prescription to mom?"

He shrugged as he reached over to return the favor. "We can just show her I guess." They continued watching the TV in silence, minus the noise of their genitals being fondled. The male host had just began talking about how pregnancy worked. A couple desiring a baby had to go to the doctor, who would give them a single-use shot that would make the woman fertile for a few minutes after a rigorous exam to make sure the parents weren't **** addicts and had financial means to support children.

Sally had changed to wear nothing but an apron, and was walking downstairs when she saw her two children watching TV as they touched each other. Her mouth fell open but no words came out. She was feeling quite frustrated at herself at how well her children (seemingly) were adjusting. Finally, she walked up to her kids.

"Hey guys, wanna set up the table for dinner?"

Surprised, both teenagers pulled their hands away from each other and simultaneously began to offer explanations. She knew **** was ok, she just didn't think her kids would be so quick to adopt it. "I know guys. Dr. Chen left me a message about it. Just when you guys...eh...have sex just tell me so I can, uh, make sure you're doing it correctly." She blushed at how obvious that was.

Her two kids looked at each other in shock, and then back at their mother. "You want to watch us...fuck?" Alex asked.

Sally, feeling very awkward and horny and frustrated, simply nodded, and immediately tried to change the subject. "So, how where classes? Any cute students you, uh, had fun with?" God she felt awkward. Why did she do this to herself?

"Um, I think Alex and I would rather have sex in private," Pat slowly responded.

"Actually," began Alex, "basically all sex here is in public. We need to get used to just going for it with no worries." She stepped forward and resumed jacking her brother off.

Pat began caressing Alex's breasts as he talked. "Ok then, we'll have sex in the park. And if anyone wants to join, we'll let them."

Alex, clearly getting horny, smiled at that answer. "And Mom should watch too."

Both kids looked over to see their mother, sweating and panicked, masturbating to try and relieve herself. When she saw all eyes on her, she began to pull back her hand, which had some of her juices on it.

Alex took her hand. "It's ok Mom. It's natural. Let's set up those dishes, get you out of those clothes, and go to the park."

Alex felt like she was walking on air, her pussy tingling incessantly with excitement. Here she was, walking to the park completely naked, about to fuck her brother with her mom watching. It felt so naughty despite being completely legal. As the three naked Artons walked up the sidewalk on a grassy field. All around them, they saw people enjoying the warm day. A father wearing only a shirt flying a kite with his just-as-bottomless son. They noticed a high schooler in a 69 with a 30s-something man. The two kids could tell their mother was more relaxed seeing really how integral sexual activity was.

Alex stopped at one of the only empty benches and sat down, feeling some liquid on her butt. "Are you sure we should sit there?" Pat asked, pointing at the sex juices scattered about the bench.

"Don't be a wimp, we're about to add so more anyway," she responded, pulling her brother into a kiss as she began masturbating him. He got the message and started groping her back, starting with her breasts, and working down to her vagina. He stuck a finger in, and felt how hot, moist, and sticky it was. He put another in and began working on her interior. Alex released the kiss and guided Pat into lying on the bench, with her kneeling above him. She slowly began lowering himself onto his thick member, both of them gasping.

She began gently moving up and down to slide it in and out of her nether lips as she looked up, eyes closed as she felt pleasure roll through her. He started bucking, so she quickened the pace. Soon, it was getting too much. Pat began groaning as Alex moaned "not yet". But it happened anyway, and soon her brother's hot spunk started flowing into her as she continued bouncing on his deflating cock. Then it happened, and Alex whined as she came all over her brother's chest as his cock flopped out.

They both took a deep breath, and got up, looking at their mother, who was rubbing her clitoris and clasping her right breast, moaning uncontrollably. She looked at her happy kids, first to her daughter, cum dripping out of her pussy, and then to her son, whose erection was rapidly returning thanks to his sexworld diet.