Nympho Waifu, a hentai visual novel developed by Marble Syrup. Released June 4, 2017. For PC Windows. Partial voice acting. Free to download.
There are three girls to choose from, and you can make all of them part of your harem! Was cheating on your wife too boring? Spice things up with cheat codes that turn your little harem into catgirls!
There are twelve endings in total, decided by the choices you make in-game. Completing two or more will unlock developer commentary! Donating to the Patreon will unlock multiple new choices and endings to explore.
Source: N4G PC [NSFW] Free Hentai Game Review: Nympho Waifu