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: Courtney Love is a real musician and actress. Kourtney Kardashian is a real TV personality. Using either name in a fictional “step-sister wife” context would be inappropriate and potentially defamatory.
While the specific title you mentioned——appears to be the title of a specific adult-oriented web novel, serial, or niche video series, the phenomenon surrounding it reflects a massive trend in modern digital entertainment: the rise of "Taboo-Lite" storytelling.