A Sam/Dean line set slightly in the future? I'm thinking Sam (with Lucifer in him) seduces Dean to sin? Maybe a deal to leave Sam's body. --I'd be Sam.--
Or maybe a Dean/Castiel line, set after Castiel's fall from heaven? Or maybe, current, too. But Future Cas' was all into the love making!
Anything Supernatural even. I want a PSL partner to play out these idears! :D