Great, and most definitely, yes:
(Mafia) Detective/suspect- for this one I was sort of thinking that they could both work for the mafia- they own you and I used to be one of their killers/hit man/henchmen until recently when my brother was killed and they didn't do anything about it. My character is angered by their indifference and leaves them. They come after him, but he kills anyone they send and is so good at what he does that no one ever finds him. Appalled that they would come after him, he starts to take revenge by killing all of their known prostitutes, and drug and weapon dealers, immediately cutting their finances. He has no other family or ways to be hurt, so they decide to involve the 'law.' Of course the cops have been noticing a rather sudden increase in the homicide of the city, but of course they won't pursue without knowing that it isn't the mafia first. The mafia orders your character to get on the case and bring my character down. (lolz, doesn't sound like there'd be a chance for too much yaoi... but I'm sure...we'd make some... )
Circus ringleader/performer-The performer is basically the ringleader's personal whore, he's an on and off drug addict, but one of the circus' most talented acrobats. The performer does what the ring leader pleases for a little extra money and because he needs to keep his job and a 'stable' living place for his little sister that he now must take care of. (if you don't like drugs or the fact that he has a dependent, it's okay, I added those factors for angst.)
CEO/ boys servant- Hmm, not sure, I was sort of thinking that the boy was an orphan who got a job to make money so that he could leave it. (he feels he's old enough and a hinderance to the place) He worked for the company happily as a gofer until one day. The CEO hears the boy's story and makes him an offer, he tells him if he will be his exclusive toy, he will pay him more and give him a place to stay. The boy is unsure at first, but gradually gives in, and once he does he is frightened and angry with how much he enjoys it. He tries to get out of it because he is a good, Catholic boy (the orphanage was part of the church) but when he tells his boss his boss turns around and black mails him. Now the only way for the boy to get out of it is by the CEO's okay, or by telling the truth to his orphanage and church. (my character's age will be sixteen/seventeen)
These are just some ideas I thought I'd put up, but these are the only three pairs I really feel like doing.... Though, Nazi/ Jew or POW or camp victim sounds good to me too. (I love men in uniforms toooo) I just haven't thought of an idea for that kind of paring yet.
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it's been a while since I've played a sub, and your list looks great to me (minus the macro cock part XD) My Rh is in my sig.......if you're interested. -welcomes- ;-) 