all-human, powerful/controlling Spike

All I remember about this fic is that Spike was in a high-powered job of some type and he controlled Buffy's every move. He switched her birth control with placebos so she would get pregnant and be stuck with him. I think she eventually gets away from him but it has a happy ending. Any ideas?

It's been a really long time but is that

Make Her Own Way by spufette

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=7410

Summary: Buffy Summers is the mistress of Spike Giles, the most powerful man in Sunnydale. She loves him, he loves her and all, but he is also a control freak. Buffy wants to make in on her own, somewhat, but Spike is not willing to let her even try. His life, Spike's, concerns Buffy, even though this is a different tale of mistress and lovers. Buffy is trying to be independent, Spike is so not married. It's Buffy that is the one who does not want to marry!

Yes! That's it! Thanks so much.