Husband and his wife's sister in law story

[abcnatural1]

Tried lot of search but not able to find this particular one. As far as I recall, husband is either a house husband or a work from home. His wife's sister in law has a baby, they connect and then they can't get enough of each other. I seem to remember one scene where they have sex in the first floor toilet at their inlaws place . Was a couple of chapters long. At the end, both divorce each other's spouses and after a period of time they get together. And it might be that the sister in law is from Jamaica or her mom was from Jamaica and her father was from uk/us.