I have a question (maybe more after the first one is answered).

I have two males and two females, is it possible to mate both females with both males each time I do a pairing?

Or will one male make sperm plug preventing the other from making a complete mating successful?

After the females are at the correct breeding weight of 1800 grams and the males are 600-800 grams how will I know both genders are ready to breed?

Any physical things I should look for?

And will BPs breed any time of the year as long as they are at the proper weight?