It really is the perfect situation for them. She gets his cock multiple times a day, he's saving what he used to spend on rent & gas coming over, & I'm constantly kept as their pet whenever not performing tasks.
The story of how I met my wife goes back to the day when one of my close friends said, "a guy wants to come over tonight for sex with her beautiful slut friend. If you're willing, come too.” And by the end of that night, I was in love with her!