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After Invasion: MC (can be male or female) is kind of war hero in a dystopian world, who made it to fame and fortune. She (or he) comes home to her (his) family and enslaves them and their neighbors. Really hot characters. My personal favorite.
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Hypno Slave: You own a mom and daughter as your sex slave and another girl to fight enemy babes. This has basically every weird shit, that you wouldn't mention in the real world. So this may be quite close to your request.
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Lust and Power: Somehow all men were turned into mad, raping demons, except for the protagonist, who has inherited magical powers from an ancestor. He protects his mom and sister from the demonic hordes but demands their sexual submission in exchange for his protection. Great artwork.
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Fate of Irnia: In a fantasy world the protagonist inherits an artefact that lets him influence women, including his mom, sister and aunt. Can be played either in either a romantic or dominant way.
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Hypno Training: My Mother and Sister: Protagonist hypnotizes mother and sister and fucks them mercilessly. They are still aware that they are being abused, but they can't defend themselves.