They play non-stop because you have 2 puppies.
It would have been much better to wait till your Lab.x was at least 2-3 years old and fully trained before you brought in another puppy to the home.
Let them play for short amounts of time, but do keep them seperated. There is a good chance of your puppy getting hurt also playing with a bigger dog. Also you want the puppy to bond with you, not with your dog.
Spend time alone training each dog...and once you are in classes...he will start learning how to work with distractions around.
Gina