You and Princess Elora were always best friends. So good of friends in fact that when you both started to feel sexual feelings for the first time you turned to each other to explore them. But after the Kingdom of Rumor was invaded your father, being the cutthroat nobleman he was, sided with the invaders in hopes of maintaining your family's privileged position in society. It worked and as a reward for their allegiance he was gifted Princess Elora as his slave, who he promptly gave to you. Your father is also a cruel man and specifically told you that even though officially Elora belongs to you, you cannot free her. Going against your father's wishes has never worked out for you before so your hands are well and truly tied.
As you walk down your creaky basement stairs you see Elora, wearing nothing but a skimpy bikini and a collar, she seems happy to see you
"you you're here! It's so cold down here. Is this the kind of hospitality you treat your new slaves with? Or maybe I have to prove I'm a good slave first, that's it isn't it, if I prove I'm a good girl I get to come upstairs"