Day One FixesKnown issueFixUpdated · 5 replies on Steam
IN HEAT: Lustful Nights: Steam Family Problem (Workarounds)
Short answer
Suggested fix (unconfirmed): Set the game to private in your library so it is not shared via Family Sharing. You can also hide the game in your library as an extra precaution.
The problem
Would everyone in my steam family see this?
What players suggest
From what I know, the game isn't shared via Family Sharing if you buy it privately or set it to private in your library. Try testing it out with a different game.
It works, thank you cool person
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.