I have no real requirements for counterparts, I just like creativity. I'm a generally open person to every form of sex or plot that is thrown on the table. My post length depends on what my partner gives me.
Here's a few ideas that I've had, but I'd welcome some of yours:
A young, married woman is a loyal dog to her husband, but after he leaves for an extended business trip, his little lamb isn't so pure. This could be played out, as her having a male best friend that wants to make her happy or a stranger that shows her what she's missing.
Too Far To Turn Back-
An uncle (or aunt) invites their 20-something year old niece to come to their home. Little does the young woman know that her family member is wanting more than just a nice visit.
This could be played out with either the aunt or the uncle, or both.
Strange But Needed-
A woman had difficulty letting herself get close to anyone, minus the handsome stranger that moves into her building and claims he's a werewolf.
Times Are Tough-
A broke college girl is near being expelled, unless she gets a job that pays 250 a night...
A Slave For Him-
A lovely princess is sold into slavery, pure and naive, only to be bought by one of the most sadistic men to live. How can such a sweetheart survive a rough and tough man, hellbent on fucking her to the moon and back?
A young woman transfers to a new office with a much older boss (man or woman), who hired her for her breasts not her brains.
I am also open to whatever you want to do. I can be a very creative partner. ;P