My wife's sister is lovely as a person, but I feel no sexual attraction to her at all, so I guess I'm safe there.
If I did lust after her, I'd keep it locked up in my head - it'd mess up my marriage, her marriage, both sets of kids. Ouch.
I did know two families in the 70's as I was growing up - they were part of my parents social circle - and at some point the two couples split and re-convened the other way round (each marying the other's ex), and both couples had kids in both marriages, leading to four sets of kids, as follows:
Man 1 + Woman 1 = Kids A
Man 2 + Woman 2 = Kids B
Man 1 + Woman 2 = Kids C
Man 2 + Woman 1 = Kids D.
A and B being step-siblings in BOTH directions.
(A and C) and (B and D) being half-siblings in both directions.
C and D being unrelated, but having step-siblings and half-siblings in common.
Subsequently one of the second marriages broke up, and I can tell you that the wedding planning for the kid of the second failed marriage was interesting...
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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