Hmm maybe he isnt a good friend as you thought.. If there was only you and him in the room then the only way you could of got banned was if he reported you :o
If you asked for another Habbo's pass, whether it be the pass for Habbo account, forum account or any account, then it is a bannable offence. I can't see how being friends with a Mod will help you in this case, as you were clearly in the wrong. The only people that can (
possibly) help you here are the office staff, although I wouldnt expect too much as they must have had clear evidence to ban you in the first place.
Click here to contact them. :)