The step rule defines the only instance in which a family member having sex with another family member is not incest. This situation is where the relationship has step- in the name i.e. Stepsister, stepfather, etc.
by General secrecy July 2, 2019
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Step rule
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• step mom
• step
• step chicken
• Step Bro
• step sister
• step mother
• step parent
• Step Off