1 Was Carlos thinking of Chris while  having sex with women  ( especially if you got him to freak out ) ? Also, did he ever had a slip up ( like calling Chris name during sex with one of the twins for example ) ? 

2 Is Nate Robert's brother ? 

1) I think early on he was trying to be straight, and so was trying to put himself in the moment. Later, if he starts to crush on Chris, there's probably some of that. He hasn't slipped up, but it's been harder for him to keep having the kind of sex he really isn't enjoying

2) No. Nate and Robert aren't related. (There's a companion fic talking about Robert's brother that you can read.)

Thanks ! Love your game btw :).