a modification preg story

hi,evrybody,I got an idea about a modification preg story.

the main content is that a woman are modified to a fetish of some religion from Africa. I have got a outline ,but

have no ability to descibe the whole story and make some details more logical.I describe the outline below.

the main character:
a woman ,who is divorced,and in her 30th ,have tow children ,but has strong sensual desire.She wants to have more

babies and feels that she will reach her climax during birth-giving

a man ,who is a doc ,and has a wife from Africa,and has embrace the same strange belief of a alien religion.The doc
want to have make a fetish for his religion to express his mind .

a black woman ,the doc wife ,and a chief nurse in his husband's clinic,who is also a zealot of the strange religion

.The black woman want to make a fetish or some kind of prop for the ritual .

the strange religion.It is some kind of sex or genitals worship.the tenets or teachings instruct that sex is more

import and women should have a lot of sex with different partners.the most sexy woman should have big tits and long

labia ,and could have sex with big cocks,even sacred animals ,and milking and lactation shows tribe prosperity.
and the tribe who worship it ,also have some sacred gods and goddess, some goddess has a big tits which hang to
her waist ,and long pussy lips hang to her kness ,also have a big belly to give birth .

the main scenarios: the woman found job in the doc' clinic ,and was chosen by the couple to modify a fetish prop in

their religious ritual. then the woman strange travel began .she was cajoled, and fuck ed and made a slave .the

couple had lots of sexual fancy with the woman , including animal sex ,and even had her give birth to a baby ,and

then began their plan to make a fetish.
the woman's tits was modified to a extreme size and could be pumped and had hormone injected ,and forced to be

lactated regularly.her cunt and womb were also modified to anormal size ,and a artifical preg was made .
her anus was not spared too.

when she was at last alike the goddess image,the couple shipped her to Africa for pilgrim.There in the tribe ,the

woman had more fanciful sexual experience ,including gang bang ,monster cock, sacred animal.At last the couple

inserted their artifical baby into the woman's womb ,and gradually increased its size to 12month fetus .and have

the woman for their most import sexual ritual.

that's some i have thought ,i want to have some more detailed scene ,and more logical.Such descriptions as the artifical baby are hard to conceive.I need some advice or help .