[Quiet Man Cometh]

Found the story I was looking for. It's in the books "Words of the Clan Mother Ahnissi" and details the creation mythology of the Khajiit which includes the Bosmer. It's hard to be brief, as the story is full of many names and details, but essentially involves the two favoured children of the mother godess. One she gives the ability to make children and the other she gives her secrets and tells her to take a child from her sister and make a new people and call them the Khajiit. Why the Khajiit are the way they are has to do with the details of the story but in a nutshell, the siblings don't get along and a third littermate tells the childbearing sibling what the other one did, and in thanks the childbearing sibling allowed the third littermate to make a people of his own, and he makes the Bosmer, at which point the two lose their relation because the Bosmer are changed too much.