A Benedict Cumberbatch pb to fill a line against this lady would be amazing. I already have the idea (it's a boss/employee line, but with a little domination and submission mixed in), but we can brain storm and alter things to your liking. Aside from Demi Lovato, I could also use Kat Dennings, Amber Heard, Aly Michalka, Lily Collins, Dianna Agron or Mary Elizabeth Winstead for my girl's face.
Alternatively, I would be willing to play an oc girl against Sherlock Holmes (again, Benedict) in some kind of line. I've just finished up series 2 of the show and wouldn't mind writing something that takes place after "The Reichenbach Fall" (or it could take place before, possibly even a prequel of sorts from before he met John). I've never really written against a character before, though, so patience with me would be helpful.
I will play against other guys for other lines, just that particular one I would like a Benedict for (though I think a Michael Fassbender or Tom Hiddleston could pull it off as well). All my lines have died off recently, so I have room to pick up quite a few and would love for them to be long lasting.