Adult PC Game: Angst v0.52 by Falling Bear Studio Win/Mac Archive

Angst is a story-driven visual novel about a married couple, Claire and Miles, navigating through Miles' new found fantasy of sharing his wife with other men.
The game explores themes of trust and communication as they embark on this unconventional journey together while focusing on the emotional and psychological toll this experience takes on their relationship, including the feelings of jealousy, insecurity and angst​

Angst v0.52 by Falling Bear Studio Win/Mac Gameplay Preview