How would the CYB characters react to Kei accidentally getting pregnant tbh?
Lang: That would vary somewhat. Since there are contraceptive techniques, devices, seals, and other options, part of the reaction would certainly be surprise. Then there would be the little consideration that missed periods are often taken as the first sign of a pregnancy, and the same contraceptive jutsu also stops those…
Kei’s first sign would more likely be something else. Like Isobu’s commentary.
Isobu: Should I be directing chakra away from your abdomen now?
Isobu: A developing human’s chakra system is even less suited for mine than that of an unacclimated adult. I am told this is a consideration regarding pregnant hosts.
Isobu: Yin Kurama is a reliable source. Or so he insists.
Kei: “This should not—Rin, the contraceptive did work, right?”
Rin: “Uh, not in this particular case. I mean, your biology is a little different from—”
Kei: “Not the point!”
Rin: “I’m trying to be helpful. I’m surprised, too, but this is something I know backwards and forwards. Ask me anything you want.”
Kei: [relieved, but wry] “…Any tips on how to tell the father about this?”
Rin: [perks up] “In fact, I have a pamphlet.”
Pakkun: [to Kakashi] “More of you and Kei can’t be a bad thing.”
Kakashi: [stunned silence] “…”
Obito: “First thing I wanna know is how you feel about all this.”
Kei: “Happy? A bit surprised, too, but it’s mostly a happy surprise.”
Obito: “Then this calls for a party!”
Kushina and Minato, as well as the rest, would be happy and supportive. Gai would probably have the best luck rousing Kakashi from his shock. And so on. :)