He came out of nowhere// blackmailed to get married// giving craps like they're husbandwif...

He didn't come out of nowhere. Unlike how ch. One seemed he was saying so, but in the later ch. He said that my family has been watching you since you sought help for our son's disease. So he knew about a Noah and the child for about a year, since the illness had manifested. He waited for Noah to come for help but he never did come. So, aside from any other possible motives, he's there to take care of his now wife and mate and their child, since Noah has been overworking to save the child and the child has been taking meds w/ drowsiness inducing side effects so he sleeps too much.