Relatively easy in this case. You need to be on sharing or NTR routes (might even function with romance paths if you allowed a serious rival at gamestart) and tell your wife that she can stay at Jamal´s Club during the christmas event and telling her to relax and enjoy it. You do not(!) need snoop for this, so it is possible even on a stag sharing playthrough.How to unlock this?
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But you have to remember that allowing her to stay will cap you max love points one level lower than currently possible and even if choosing all love options later means 8 love points are max up to .034. If you want to gain current max of 9, you should tell her to come home.