I really have a hard time believing that Weiss could ever be a bad guy. I think he's written as one of the only normal, unambiguously "good guy" characters on the show. He's been friends with Vaughn for so long, and he's really been there for Syd this season. It would be too much..almost like seeing Vaughn or Will turn out to be evil. I highly doubt that'll happen. Not to mention the fact that it is IMPOSSIBLE to imagine Weiss having "S&M type sex" with anybody. :rotflmao:
Lauren, on the other hand, is the perfect candidate. She's been written to be cold and unlikable, and since she's a relative newcomer, it would be completely believable to learn that she's up to no good.
As far as the sex goes, I'm also praying that it's not Sloane and Lauren, just because I think it would make everyone sick. Sark and Lauren seems more likely, but he's pretty in love with Alison, so who knows? Other than those 2 men, who's left? Simon's dead, Lazarey appears to be a good guy....This one's a puzzler.
And....I'm an evil spoiler hound who deserves to be knocked in the head with a brick for even coming into this forum. I was so good last year! What happened to my steely resolve?!?