Sakura

as one all three of the other occupants looked at Sakura. seeing this her eyes widen and say "what why me?"

"I may love my sister but not in the way that i will sleep with her to get her pregnant," said Itachi in a tone that left no room for argument.

"yeah no never happening," said Sasuko with a sickly look on her face.

"and it is dangerous for a female Jinchuriki to get pregnant," said Naruko. "so that leave only you."

"but you can do a true transformation couldn't you get Sasuko pregnant," asked Sakura looking for another way.

"sorry Baa chan wondered about that and did a few test. I may be able to make the equipment and use them but all I would shoot are blanks," said Naruko. "sorry Sakura but you really are the best choice."