George R. R. Martin's A Song of Ice and Fire books (A Game of Thrones, etc) includes Jaime and Cersei Lannister, m/f twins who have three children together quite unbeknown to Cersei's husband (he thinks they're his).
I can't think of any others off the top of my head, though.
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Date: 2010-03-26 07:08 pm (UTC)I can't think of any others off the top of my head, though.