Natori watched and listened calmly as each instructor spoke. It was a training regiment that he couldn't say he appreciated or even liked, but he did intend to apply to it. And soon one, then two and then three of his fellow Jinchuriki made their ways to receive the gravity seal. He paid close attention to each. The two males showed no signs of fear or discomfort before the seal applied. The discomfort would, however, become apparent after. However, the female displayed very very subtle hints of fear. He almost couldn't tell. Of course, he could because he was paying such close attention to everyone. Still, he wouldn't say anything about it. He didn't know her well enough too do so after all. 

Natori glanced around at each instructor for a moment once more and then figured it was about his turn. He closed his eyes and took a breath before walking forward. "I suppose I am next Mario-Sensei." He spoke calmly as he stood before the man. He removed his upper layer of clothing and for a moment, it seemed as though he had no seal. That is until his skin began to fall apart. At least that was how it looked. The "skin" Began to gather at his feet taking the form of sand. As the second skin peeled away into it's true sand form eventually his seal came into view. 

The primary part of the seal laid over his heart. The markings were rather tame save for what appeared to be an open mouth with sharp teeth and fangs around it as though a beast were attempting to eat it so as to reach his heart. Upon closer inspection there appeared to be eyes just over the maw of the "beast" but that wasn't an accentuated detail. Extending from the primary seal were various markings, resembling the curse seal marks of the Shukaku's body, stretching out to Natori's left arm and downward towards his wrist. These markings also reached around to his back slightly ending just over his left shoulder blade. 

The creator of this seal had many things in mind upon it's creation, but as to what those things were Natori had no clue. He doubted that anyone would know and the artist simply left the somewhat complex seal and design. He never explained, nor did he seem to intend to. Being that it worked well, nobody questioned him further. The Kazekage, Natori's adoptive father, even praised the design thinking that it would look somewhat cool when he got a bit older and bulked up. But as of now, Natori generally kept it covered and hidden with his armor of sand. He stood before the fuinjutsu master, the upper layer of his clothing in his hand as the sand swirled about his feet slowly. Being that it was a seal and not an attack of any form the sand likely wouldn't react to it. And thus he waited to experience the same discomfort that the other's did. Though it might have been on a somewhat smaller scale being that he was used to putting on extra weight in the form of his sand armor.