8 - better than Rayne *shudders* I like ones where everyone's happy (and I adore Simon/Kaylee) but Jayne Kaylee isn't that bad. I can see an OT3 coming out of this, if it's worked right (Simon having to stitch Jayne up, that could lead to some action and later deeper feelings etc. in addition to how they could both feel for Kaylee) Our society tends to frown down on relationships that aren't monogamous, but that doesn't mean they can't exist (obviously, lol)
10 - I know this would totally throw your OC out, but you could write a romance about him and Helen (from Firefly episode Heart of Gold). With Petaline having taken over for Nandi, there could be some call back for help with something small from Serenity and after another night or two with Jayne something could occur and she could leave Deadwood on Serenity or something like that as a starting point? If you do something like that, I'd love to read it!
8, 10
10 - I know this would totally throw your OC out, but you could write a romance about him and Helen (from Firefly episode Heart of Gold). With Petaline having taken over for Nandi, there could be some call back for help with something small from Serenity and after another night or two with Jayne something could occur and she could leave Deadwood on Serenity or something like that as a starting point? If you do something like that, I'd love to read it!