Selina Kyle and Dinah Lance, our very own Catwoman and Black Canary, were the first DCU femslash couple I wrote. The first of their many cat-o’nine tales is The Cat And The Canary I: The Cat Swallowed The Canary, a tale of lust and debauchery! ;)
The entire series (six tales so far) can be found here.
Also, I write Diana/Dinah and Linda/Barbara, and their stories can be found here.