You know how it is. Read a story forever ago, can't for the life of you find it again.
Story 1: A brother and sister are poor and fending for themselves. She's addicted to drugs, he's meek and passive. Brother decides to prostitute himself to a wife and older woman who wants to be his mommy. Turns out she's a hermaphrodite (both parts) and begins to have him live at her house under the cover of being a student. Sister then joins as well under the cover of his wife. Sister will eventually seduce the wife/mommy's husband. Happy ending for all.
Story 2: A man and woman are stranded on a planet. This planet is home to hypersexualized human-like people. Over time, the woman becomes more hypersexualized herself. Ending culminates in the man returning to claim the village in a harem sex off. (I know...)
Story 3: A man wakes up in a terrarium with a bunch of women. Turns out an alien species kidnapped them to breed an army. Both the MC and the women involved have become hypersexualized for breeding. An alien will take the form of a human but over time fall in love with the MC. With her help, they take control of the spacecraft (including all of their kids) and head home.
Story 4: A husband, who always wanted a big family, and wife can't have kids, and so the wife brings in a young woman to be with her husband. She becomes a cuckquean while the husband and your woman slowly fall in love. It ends with them having a bunch of kids together.
Thanks for your time, and maybe one day finding stories can be easier. 😅