What change(s) in behavior occur after pregnancy/birthing.?

[Kutay]

Two very bonded, non-sibling cats, almost one year old, one boy, one girl. Boy impregnates girl. How will her behavior change toward him during the course of the pregnancy? Will he expect her to continue to play with him as she gets bigger, or will he, on some level, understand that she has "changed?" How will she react to him as her pregnancy progresses? After giving birth? How will he react to the newborns? After the kittens are grown up and gone, will their friendly relationship, maybe not the playfulness, but their mutual contentment from contact with one another (examples, curling up and sleeping with each other, grooming one another) resume? Can anyone speak to this from your past personal experience? Thanks.

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