This multi-part story is one of my favourites from back in the day, which I still revisit from time to time. I've still read precious few stories from the perspective of a highly horny bisexual pregnant woman.
https://www.asstr.org/files/Collections/...Jackie.txt
https://www.asstr.org/files/Collections/...s%201b.txt
https://www.asstr.org/files/Collections/...s%201c.txt
https://www.asstr.org/files/Collections/...s%201d.txt
https://www.asstr.org/files/Collections/...Jackie.txt
https://www.asstr.org/files/Collections/...s%201b.txt
https://www.asstr.org/files/Collections/...s%201c.txt
https://www.asstr.org/files/Collections/...s%201d.txt