Not completely, the technology is not up to scale for that.

"I'm not able to build one that you could fit through yet. We need to test a lot of things before that. This is the best I can do." She explained showing a pair of strange rings about the size of the palm of his hand. He could see circuit like lines on them in an unreal looking color. It was the signature of one of these new elements that had recently been discovered, they had a color that was totally out of the regular color spectrum and impossible to describe with existing words.

"Yeah, I don't think I would fit through these."

"No entirely at least. I did a lot of tests on inanimate objects, plants and a few rats. I can detect no alteration to the matter going through the portal and the rats are completely healthy even if kept midway through an open portal. Now I need a sentient subject so that you can describe what you experience while going through it."

"But like we said I can't go through it."

"Part of you can and it will help us a lot getting detailed feedback. Drop your shorts, thanks for getting it ready by the way."

"Wait! You want me to put my dick inside of some weird portal?"

"It's perfectly safe, I just want to check if you keep perfect control and sensory input while doing it. Think about it, one day thanks to you a surgeon might save lives on the other side of the world by putting their arms through portals to operate. Of course if you want to stop be my assistant I'll just inform mom of that."

K-T had little choice. He knew that even if her sister's inventions could be embarrassing for him she wouldn't put him in real danger.

He lowered his shorts, revealing a throbbing 9 inch cock with a pearl of precum forming at the tip and a pair of impressive low hanging balls. His sister smiled at the show he was giving her.

Without asking for his permission she simply kneeled in front of him. The two rings in her hand stacked with a clicking sound and then separated in two half rings two layer high. She presented the half around his genitals, going behind his balls and above his cock before closing them. Once closed the rings looks seamless like if each was made of a single piece of metal.

She went back to her computer and started typing for a few minutes. K-T was just standing there, his dick pointing up.

"K-T, can you please grab your dick firmly for a moment." She asked him. K-T really didn't get what she was doing, he had seen no portal so far and his dick was still here despite being through her device.

He obeyed her and grabbed his cock with his right hand, hoping that he would not just cum in front of her in her lab. He had been playing with himself for a while when she had summoned him and he wasn't really far from finishing.

"And it's done! Let's see what we got!" she said, pressing a last button. K-T felt more weight in his hand and when he looked down to see why, he noticed that the two rings had separated, his cock was no longer attached to his body.

He now had a ring filled of a circle of the weird otherworldly color stuck on his crotch and was holding his cock and balls in his hand, with the same device glued to the base of it. Despite the lack of physical link between his body and genitals he felt nothing odd at all. He could feel his hand on his cock like he could a few seconds ago.

Emily suddenly grabbed it away from him and plopped it upward on her desk under some scanning apparatus, he could know feel the cold metallic surface his balls were resting on.

"It works! Feel anything wrong?" she asked him without even looking his way, transfixed by her technological breakthrough or maybe the sight of her brother's massive erect cock?

"No, it looks weird and this desk is a bit cold for my balls comfort but it feels normal otherwise."

"I will have to run a lot of tests now."