Just because they are black does not mean you will have black colored kids. I bred my black, blue eyed Nigie to a black, regular eye color doe and I got one blue eyed beige kid and one regular eye colored browish kid.
I also have another black doe who had triplets one cool colored brown kid and two white with gold. Not sure how Pygmies throw color but with Nigies it is surprise everytime
If your buck has true blue eyes, those are dominate and your kids will be blue eyed. If he has blue marble eyes then you can have regular eye colored kids when bred to a regular eye colored doe. Marble eyes have flecked of brownish-gold in the blue. My buck has marble eyes, he had 7 out of 10 kids with blue eyes when bred to my regular does.
So if you breed him to Oreo those kids wil have blue eyes, if they both have marbel eyes you will still mostly likely have blue eyed marbled kids.
Your buck may have Nigie somewhere in his background.
You should pick him up a wether friend. He will cry being alone, when you sell him the wether can be with the girls until you get a new buck. Also if he is alone he will do his best to break out of whatever you put him in to get to the goats, not just to breed but also for companionship.