I'd love a PSL involving an age-gap. Can involve incest (father/daughter or uncle/niece, maybe) or just an older man/younger woman. Teacher/student is also an option (I wouldn't mind playing the older woman in this line, actually, as long as it was sufficiently interesting!) Basically, just looking to play a younger woman against an older man, with some sort of taboo or forbidden aspect. Long-term would be amazing, as would getting to play out the nuances of the relationship.
This could move to a community, if that's preferable. PBs are negotiable!