My Sister Is Naruko

He traveled to the world of Naruto and became Naruto's twin brother, and replaced him as the Nine-Tailed Jinchuuriki. But... Why did Naruto become Naruko? Besides! "Naruko, we are brother and sister! Don't do this!!!" Naruto was tied to the bed by Naruko and said without tears. After Naruko heard this, she slowly got on the bed, sat on Naruto's belly, and said with a smile. "Hey, brother. As long as there is love, it's okay to be brother and sister, right?" Then, in Naruto's horrified eyes, he slowly took off his clothes, revealing his plump body, and then... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.