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"Alright, this may surprise you, but I actually have a theory that Naruko was sealed inside Naruto."

Both twins' eyes widened as they heard this. "Really?"

Jiraiya nodded. "Yup. The first question I have for you is in regards to when you started swapping genders involuntarily. Did anything feel weird while that was happening? Did it feel like there was any form of pulling or pushing on your bodies?"

While Naruto shook his head, Naruko nodded slightly. Jiraiya cocked his head in interest. "Really? What happened during that?"

Naruko's brow furrowed as she tried to find the right words. "Well... I duno, it just felt like something was pulling at my body. Only bits and pieces at a time but towards the end it was all over me, like it was trying to drag me through a wall."

Jiraiya nodded. "That would make sense. It was actually Naruto's body getting ready for the split. Bits of you were being moulded into his form to make sure that when you split, everything inside the seal was correctly replicated outside the seal."

Naruto took a moment, but then piped up. "But... if that's the case, why did I need to actually go through that? Wouldn't it have just meant that whatever was inside the seal would have just been unsealed, like a standard kunai or something?"

Jiraiya shook his head. "I have a theory for that as well. I'm thinking that due to Naruko never actually having any physical exercise, she would have been rather stunted in her growth."

He pulled the seal papers out again and pointed at a section of them. "See this bit? It acts as a major part of the containment seal, but when written by itself, it actually is a kind of copy-and-paste symbol. It was one of the first bits of the seal to distort, so I'm thinking that what it was doing was copying all of Naruto's strength and stamina, to you."

Troubles of a Genderly Confused Teen, Chapter 28