You were pretty much answered but id like to give my two cents :D

He did rape Luka sadly. It was also heavily implied that he was ''waiting for Teuta'', therefore wanted to rape her... The sequence in which Adam stops him also implies that - be it because of the drugs, or an innate incestuous feeling towards Teuta - he was very possessive of MC.

I don't know if Adam died, but i'd say no, however, his future is very incertain... All we know is he went off to his home country, and who knows if he'll ever come back to his friends, because of either his sickness or his guilt... (flashback to the CG on the railroad and him looking back alone) ANDDDD the waterworks are back lol

Yang was a woman, yes. I don't think it had anything to do with the plot, though. it was just a character detail.

man, I wish I knew. he indeed is EXTREMELY hot. My favourite lol. He was very sweet too :(. I just wish he didn't have all that hair over his face, he's so cute with it away!

I did not like Limbo's route at all, though. <