Trying to find these stories

Story 1: Has 5 chapters 1) Kristen returns 2)Room Service 3)The Invitation 4)The Master 5)The library - Story is about a girl named kirsten who is hired for a 2 year contract. First part she puts herself in bondage.

Story 2: This one is from a while ago. A girl befriend an army guard, he takes her to a secret hangar on base where she straps herself into a bondage machine, she is unable to get out. He gets pissed and they flee. Late he gets in trouble for letting her in and she comes back and locks herself into the machine perminantly

Story 3: I can remember very little bout this one, but it involved a girl locked ina stable. First part she was wallowing in the mug in the stall like a pig. The guy kept her there for a weekend I think

Story 4: Teenage girl puts herself in self bondage with nipple clamps on waiting for her dad to come home, but nipple clamps really start to hurt her and of course she can't reach them now. Dad comes home and removes clamps then puts them back on to teach her a lesson.

If anyone knows theses stories I'd really appreciate a heads up on the titles.
And if you happens to know any others like them, esp story 1 post them too.

Thanks
Lee