His protagonist Lazarus Long sexes up his mom toward the end of Time Enough for Love. A variation: The Chessmaster Littlefinger is simultaneously striving to go off his childhood close friend and unrequited like Catelyn's daughter Sansa (who appears strikingly like her) as his all-natural-born kid and making an attempt to seduce her, evidently seeing Sansa as a Replacement Goldfish for her mom.