Sealed

Two men are paid to find some eye candy for some rich bastard so they find
a pair of sisters and kidnaps them, choosing to keep the oldest and start bargaining with the rich guy over the younger one.

But little did they know someone otherworldly was waiting for a chance like this to make the oldest sister theirs.

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(Needed to rate it mature once I realized how violent it's going to be)
Sorry this description isn't very good so I'd advise reading the first chapter and choosing if it's to your liking by that. The first chapter is going to be a bit... tamer than the later chapters cause it is only the beginning for this "lucky" woman.