1. "I meant Mom fucking her boy, especially in front of his girlfriend." I'm not sure about the infront of the girlfriend part. Till now at least as far as I know, there is only the MC giving blowjob to mom scene with more to be added later as the quest about visiting the MC's mom is still ongoing.
2. "How do you go from Copper to Silver?" I believe it was something like raise your Guild points to a certain level, then rest a night, then go to the guild next morning to get your rank updated (Your GF should be at the guild counter when you go to get the rank upgraded). It's best if you follow the Quest menu as it will tell you what to do, most of the time.