Story about being dominated at in - laws

[Splash_bros]

I read this story where the protagonist (a married/engaged woman) goes to her in - laws house. Her sister in-Law brings her boyfriend who is hung. He has sex with her mother in - law. When the protagonist confronts him, (in front of the entire family) he fucks her in front of all of them, even making her husband take off her clothes.

Does this seem familiar to anyone?