Ok, it's been so long that i even forgot there is no quest log. Since you've seen the threesome with the cousin it shouldn't take long until the aunt comes into play. It may take a few days. Be sure you have explored any sexual combination (threesome in the lounge, scenes in the bath etc) and it should work out. Maybe it's got (also) something to do with high love and/ or domination points (90/97 here ). Spoiler : It will happen automatically one morning.I am already open scene between mc sister and cousin and this scene last in game. I search everywhere and nothing.
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